exchange and transport in animals Flashcards
(315 cards)
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why is it important for vital substance to be transported into organisms
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to dispose of waste products
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what are three examples of vital substances to be transported into organism to dispose of waste products
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- plants take in carbon dioxide as it is crucial for photosynthesis and they get rid of oxygen because it is a waste products
- cells need oxygen for aerobic respiration, which CO2 as a waste product
- kidney efficiently removes waste such as urea and excess ions. if the excess urea is not removed, it will build up in the body and become toxic
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what are exchange surfaces
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specialised structures in living organisms where materials are transferred between organisms and its environment
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what are three reasons why exchange surfaces are important
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- efficient transfer of essential susbtances
- maintain of homeostasis
- support of key life processes like repsitration
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what are four characteristics of efficient exchange surface
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- large surface area - to maximise area for exchange
- thin walls - to reduce the distance that substances need to travel
- good blood supply - maintains good concentration gradients
- moist surface - facilitates diffusion of substances
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what are three examples of exchange surfaces in living things
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- the alveoli in the lungs are exchange surfaces for gases
- in the small intestine, the villi increase surface area for nutrient absorption
- in plants, the stomata in the leaves allows for gas exhcnage
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what is a ratio
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how big a value is compared to another
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the larger the organism is ..
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the smaller its surface area compared to the volume
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how do you find the volume
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length x width x height
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what are the alveoli adapted for
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gas exchange
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in order for the alveoli to get the energy they need to function, what needs to happen
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all our cells must carry out cellular respiration
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what do you need for cellular respiration
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oxygen
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what is the role fo the lungs
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to find the oxygen we need from the air around us into our blood stream where it can be transmitted to the body
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what happens when you breathe in
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- air passes throught our mouth/nose and then down the traachea
2.and from there divides between our two bronchi
3.and further divides between successive branch like structures called bronchiloes - once the air has made its way through all these branches it reaches these small sacs that are arranged like bunches of grapes , alveoli
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alveoli are the site of…
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gas exchange
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adaptations of the alveoli
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- made up of one larger layer of very thin cells - creates a short diffusion pathway + increase the rate at which co2 and o2 can diffuse across
2.large surface area - moist walls - allows gases to dissolve, this increases the rate of diffusion
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what is the equation for breathing rate
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number of breaths taken/ number of minites = BPM
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when does your breathing rate change
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when you exercise
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when the blood in the capillaries return back to the lungs, what happens
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the haemoglobin in the red blood cells will have already given u0p lots of urgency to the tissues which means that there wont be much left and because the alveoli is full of oxygen, they will have the perfect concentration gradient. the oxygen in the alveoli diffuses down that gradient into the blood and the cycle starts again . the co2 will be at a higher concentration than the alveoli which means it could easily diffuse across and once in the alveolii we can breath I out.throughout the whole process blood keeps on moving with a constant supply of deoxygenated blood entering the capillaries and oxygenated blood leaving it
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what is carbondioxide carried by
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it is dissolved in blood plasma
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what is the equation for the rate of diffusion
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surface area x concentration diffrence / thickness of membrane
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what is the rate of diffujsion directly proportional to
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the concentration gradinet
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what is the rate of diffusion invesely proportional to
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the diffusion distances
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the larger the surface area and the concentration gradient....
the higher the rate of diffusion
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the smaller the diffusion distance...
the faster the rate of diffusion
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how many parts are there in the human blood
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what is plasma
the liquid part of the blood
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what can we find within plasma
white blood cells, red blood cells, platelets
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what are platelets
tiny fragments of cells
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what does plasma carry
1. nutriets - eg glucose + ammino acids
2. waste products - eg co2 and urea
3. hormones, antibodies, antitoxins
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what is the job of plasma
1.to transport dissolved susbstaances around the body
2. transpoers digestive product such as glucose to the small intestine and other major organs
3. transports co2 produced by aerobic respiration from the organs to the lungs to be breathed out
4. transport ure\ from the liver to the kidneys to be excreatedd in urine
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what makes the blood watery so it can flow
plasma
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what is the role of redblood cells
to transport oxygen from the lungs to the body cells so that our blood can use it for cellular respiration
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what do redblood cells contain
hameglobian
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where is oxyhameglobin made
the lungs
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what two molecules combine to make oxyhaemglobin
haemoglobin and oxygen
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what is hameoglobin
an oxygen carring molecule
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adaptations of red blood cells
1. no nucleus - more room for haemoglobin
2. dimples in the centre of the red blood cell
3. biconcave shape - larger surface area so oxygen can diffuse in and out more quickly
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three examples of white blood cells defending against pathogens
1. phagocytosis - where a white blood cell will consume a pathogen
2. producing antibodies which bind to pathogens and help destroy them
3. antitoxins which neutralises any toxins that the pathogens produce
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what are white blood cells
part of the immune system
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what do white blood cells contain
1. nucleus
2. dna in nucleus encodes the instructions the white blood cells need to do their function
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do platelets have a nucleus
no
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what is the role of the platelets
to help the blood to clot
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how do platelets work
1. float in the blood
2. wait till there is a cut
3. clot the area where clot is
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what do platelets help to stop
1. blood pouring out of us whenever we get a cut
2. microorganisms from getting in because they could cause an infection
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how much blood do adults have
5L
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when the adult 5L of blood drop too low what do doctors do
give the patient new blood, there are two types : artificial or blood tranfusion
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what happens if the 5L blood drops
there might not be enoug blood left over to deliver the required blood to their tissues
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what is artificial blood
a blood substitute that consits of salt water
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what does artificial blood do
add volume to our circulatory system which keeps the vessels full and allows the heart to keep pumping
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what is a disadvantage to artificial blood
doesn;t have any red blood cells so it doesmt actually allow us to transport oxygen, can only replace 1/3 of our blood with ti
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what is a more beneficial option than aritificla blood
blood transfusaion
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what are the issues with using prodcuts from blood
1. in a blood transfussion we have to make sure that the donated blood is the same as the patients blood
2. immune system could reject the blood and the patient will die
3. lots of different diseases can be transferred by blood
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what is a blood transfusion
where a person is given real blood that has been donated by blood donors, which comes with its own red blood cells which is the key to serving bloiid
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what are the three many uses of donated blood in medicine
1. to replace blood lost in inury
2. some people are giving platelets extracted from blood to help with clotting
3. proteins extracted from blood can also be useful for example antibodies
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what kind of circulatory system do we have
dounble circulatory system
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how does blood travel to the heart
1.blood is pumped from the heart to the lungs where it collects oxygen
2. the blood then returns to the heart and is pumped around the whole body, where it delivers oxygen to the body cells
3. once the blood has passed through the organs, it goes back to the heart via the veins
4. the blood is travelling slowly and at low pressure . this means it could stop or go backwards
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what do arteries carryh
very high pressure bkood from the heart to the organs in the body
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where do arteries carry blood from
ARTERIES AWAY from the heart
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adaptations for the arteries
1. thick muscular wals - allows them to withstand ver high pressure of blood
2.elastci fibers which stretch when the surge of blood passes through and then recoil in between surges which keeps the blood moving
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how can you feel you pulse
blood travel thoruhg the artieries and surges every time it beats, this surge can be felt in the wrist as your pilse
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adaptations of capillaries
1. very thin walls - diffusion pathway is very short, allows substances to diffuse rapidly between the blood and the body cells
2. permeable - can easily diffuse through them
3. one cell thick `
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what happens when blood passes through the capillaries
susbtances such as glucose and oyxgem diffuse from the blood into the cell and carbon dioxide diffuses from the cell to the blood
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what do many veins have
valves
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adaptations of veins
1. thin wall - blood pressure is low, doesn't need to be thick
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what happens when blood is flowing in the correct direction
the valves open to allow blood to flow through
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what is the job of valves
to stop back flow
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what is the circulatory system
an example of an organ system
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what is the roile of the circulatory system
to transport oxygen and nutrients to our body tissues
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what does the the circulatory system reliey on
1. the blood
2. blood vessels
the heart
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what do the blood vessels do
hold the blood
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what is singular of atrium
atrium
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what is plural of atrium
atria
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what is the heart
an organ consitsint of mainly muscle tissue
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how many chambers does the heart have
4
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what are the four chambers of the heart
left atrium, right atrium, left ventrible and right ventricle
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where ae the left atrium and rightr atroum located
at the top of the heart
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where are the left ventricle and right ventricle located
at the bottom of the heart
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what sepearatres the atria from the ventricles
valves
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what are the four main blood vessesls in the heart
1. vena cava
2.pulmonary artery
3. pulmonary vein
4. the aorta
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what is the role of the vena cva
brings deoxygenated blood from the bidy
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how does blood flow through the heart
1. blood enters the left atrium and right atrium
2. the atria now contract and the blood is now forced into the ventricles
3. the ventricles now contract and force blood out of the heart
4. the valves in the heart stop the backflow of blood into the atria when the ventribles contract
5.the left side of the heart has a thicker msuculaar wall than the right side
6. the right ventricle only pumps blood to lungs
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why is the left side of the heart thicker than the writer
because the left ventricle pumps blood across the entire body, so it needs a thicker muscular wall to withstand high pressure
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what is a pacemaker
the natural resting heart rate controlled by a group of cells found in the right atrium
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what happens if your pacemaker stops working properly
doctors can implant an arrtificial pacemaker
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what is an artificial pacemaker
a small electrical devise use to correct any abnormalities in your heart
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what is the purpose of the coronary artery
to provide oxygen to the muscle cells of the heart
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what is metabolism
all the chemical processes which occur within a living organism in order to maintain life
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what is energy used for
movement
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what do humans and other mammals need energy for
to keep warm
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we need energy for chemical reactions, to do what
build larger molecules
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is respiration exothermic or endothermic reaction
exothermic
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why is respiration exothermic
because it releases energu
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what is cellular respiration
an exothermic reaction that transfers energy from glucose and is continuously occurring in living cells
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where does respiration continually take place
in living things
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where does aerovic respiration take place
in the mitachondria
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what is the word equation for aerobic respiration
glucose + oxygen -> carbon dioxide + water + energy
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why does aerobic respiration releae a great deal of energy
this is because ggthe glucose molecule has been fully oxidised
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what os the symbol equation for aerobic respiration
C6H1206 + 602 + 6H20
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when do cells only carry out aerobic respiaration
if oxygen is present
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when do cell carry out anaaerobic respiration
when oxygen is not present
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what is the equation for anaerobic respiration in humans
glucose -> lactic acid
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when does anaerobic respiration onlu happen
if we cna't get enougj oxygen to our tissues to keep up with the demands of the more efficient aerobic respiration
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how does anaerobic respiration release less energy than aerobic respiraation
because in anaerobic respiration, the oxidation of blucose in incomplete
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what is the equation for anaerobic respiratin in plant and yeast cells
glucose -> ethanol + carbon dioxide
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whatt is fermentation
anaerobic resooiration in yeast cells
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what can we use the equation for anaerobic respiration to make
alcholic drinks such as beer or use yeast to make bread
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co2 in anaerobic respiration in plants and yeast cells is useful, what happens that makes it useful
when co2 is produced, bubbles form in the dough, causing it to rise
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how can we measure how well the heart is working
cardiac output
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what is stroke volume
the volume of blood exxpelled out of the heart in one contraction
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what is heart ratge
the number of beats per minite
