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pathway test Flashcards

1
Q

The three parts of the circulatory system are what?

A

The three parts of the circulatory system are the blood, the blood vessels, and the heart.

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2
Q

On each side of the heart, the atrium and ventricle are separated by what?

A

valve

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3
Q

which ventricle is the thickest and why?

A

The left ventricle has thicker walls because it has to pump blood all the way around the body.

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4
Q

Which blood vessel carries deoxygenated blood from the heart to the lungs?

A

The pulmonary artery

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5
Q

Which blood vessel carries oxygenated blood from the heart to the body?

A

aorta

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6
Q

Pacemaker cells are found in which chamber of the heart?

A

Right atrium

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7
Q

what do arteries always do?
(Blood)

A

They carry blood away from the heart

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8
Q

what does the coronary arteries supply the heart muscle?

A

The coronary arteries supply the heart muscle
with oxygen and nutrients.

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9
Q

what is the function of arteries ?

A

carries blood away from the heart

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10
Q

what is the function of veins ?

A

to carry blood from the body (or lungs) back to the heart.

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11
Q

what is the function of capillaries? (3)

A

exchange substances with cells (nutrients and oxygen)

take away waste products (CO2)

and they connect your arteries and veins

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12
Q

key facts about capillaries. (4)

A
  • really small
  • lower blood pressure (which gives the blood time to exchange things with the tissue)
  • single cell thick
  • permeable
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13
Q

key facts about veins (6)

A
  • low pressure
  • joined up with many tiny capillaries
  • has valves
  • has the biggest lumen
  • has small layer of elastic fibres + smooth muscles (wall surrounding the lumen)
  • one cell thick
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14
Q

how to calculate backflow

A

how much blood/time

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15
Q

key facts about arteries (4)

A
  • high pressure because just pumped out from the ventricle.
  • strong - thick layer of muscle tissue
  • elastic - thick layer of elastic tissues
  • narrow lumen - which keeps the blood pressure high.
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16
Q

why are capillary walls so thin?

A

allows easy exchange of oxygen, carbon dioxide, water, other nutrients and waste products to and from blood cells

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17
Q

What are the nutrients that are exchanged between the blood in the capillaries and the body tissues?

A

Amino acids

Glucose

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18
Q

Which substances are waste products that are exchanged between the blood in the capillaries, and the body tissues?

A

urea
carbon dioxide

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19
Q

Which substances are exchanged between the blood in the capillaries, and the body tissues?

A

Carbon dioxide

Glucose

Oxygen

Urea

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20
Q

In which order does blood flow through the three types of blood vessels?

A

Heart ➔ arteries ➔ capillaries ➔ veins ➔ heart

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21
Q

role of red blood cell?

A

to carry oxygen to our lungs so that our cells can use it in cellular respiration

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22
Q

permeable

A

Permeability is the ability of a material to allow the passage of molecules

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23
Q

partially permeable

A

meaning its selectively permeable, i.e. being permeable to only certain molecules and not to all molecules.

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24
Q

what make the red blood cells red?

A

haemoglobin

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25
what does haemoglobin do?
combines oxygen to become oxyhaemoglobin. once the O2 finished travelling then the oxyhaemoglobin can split back into just haemoglobin and oxygen again so they are free to diffuse into our tissues
26
red blood cell adaption
- has no nucleus - means more space for haemoglobin and oxygen - shaped like a biconcave disk - LSA for absorbing oxygen.
27
ways white blood cell defend us from the pathogens (3)
- phagocytosis - engulfs or consume the pathogen (microorganism) - produce antibodies - bind onto pathogen + help destroy them - antitoxins- neutralises any toxins that the pathogens produce
28
key points of platelets(3)
- small fragments of cell - no nucleus - float about in the blood
29
platelets function
wait in blood until you get a cut. they rush to the wound and act like a glue to patch up the hole this is called 'clotting'
30
what does platelets prevent
- decrease loss of blood - stops microorganisms in as it can cause an infection
31
what do plasma carry 8+
- all other blood cell. Nutrients: glucose, amino acids, fatty acids, and glycerol Waste products: carbon dioxide and urea Other substances: hormones, antibodies
32
What is the role of blood plasma?
To carry substances and cells around the body
33
what is coronary heart disease
- coronary arteries which supply blood to heart muscles start to get blocked by the build up of fatty material this causes the lumen to become narrower so less blood can flow through meaning less oxygen reaches the heart muscle and as the heart needs lots of O2 it causes strain to the heart which becomes a heart attack.
34
coronary heart disease treatment
1. stents - expandable tube that we can place inside the arteries to hold them open which ensures the blood can keep flowing - statin is a medicine - alters the balance of cholesterol (LDL and HDL)
35
advantaged and disadvantages of using a stent to heal coronary heart disease
- quick surgeries - effective for a long time -require surgery that always has risk (heart attack or infection) - small risk of the patient later developing a blood clot near the stent (thrombosis)
36
advantaged and disadvantages of using a statin to heal coronary heart disease
- reduces risk of not only coronary heart disease but also diseases like stroke and heart attack - has to be taken regularly for years. - can cause side effects like headache and kidney failure
37
what if the valve gets damaged or weakened ?
replace it with a biological or mechanical valve - require surgery (risk of blood clot)
38
name three things that make up the cardiovascular system
heart blood blood vessels
39
Which chemical process supplies the majority of the energy required for the contraction of muscle tissue?
Aerobic respiration
40
What are two problems that may be caused by faulty heart valves?
Not enough blood can pass though the valve Blood can pass backwards through the valve
41
The drug digitalis originated from plants known as _________. It is used to treat heart conditions such as heart failure.
foxgloves
42
Stages of drug development (4)
Stage 1 - Test the drug on human cells and tissues. Stage 2 - Test the drug on live animals. Stage 3a - Test the drug on healthy volunteers to find the maximum dosage before side effects occur. Stage 3b - Test the drug on patients that suffer from the relevant disease, to find the optimum dosage.
43
Why is it important that new medicinal drugs undergo testing before they are used?
To make sure they are an effective treatment To determine the optimum dose To make sure they are safe to use
44
In a double blind trial, who knows who is given the trial drug, and who is given the placebo?
Only the researcher
45
Patients in clinical trials are often given a placebo. What is a placebo?
A substance or treatment that contains no active drug
46
Medical trials often use placebos, and are double-blind. Why is it important for medical trials to be double-blind?
To avoid any bias by the patients and/or researchers If patients know they received the drug they may be more likely to report side effects If researchers know who has been given the real drug then they may pay closer attention to those patients
47
what definition of osmosis do we need to know?
Osmosis is the net movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration
48
In living organisms, the partially permeable membrane is usually the ___________
Cell membrane
49
What would happen to red blood cells if they were placed in pure water?
They would gain water and swell
50
A microscope is designed to...
A microscope is designed to... ...magnify small objects so that they appear larger.
51
What is the definition of magnification?
how many times larger the image is than the object?
52
What is the pathway of light through a microscope?
Light source ➔ stage ➔ microscope slide ➔ object ➔ objective lens ➔ body tube ➔ eyepiece lens ➔ eye
53
what are the 2 microscopes?
light microscope electron microscopes
54
disadvantages of light microscope (2)
- not good enough to study subcellular structure - any details less that 0.2um will appear blurry
55
advantages of light microscope (3)
easy to use relatively cheap colour
56
disadvantages of electron microscope
very expensive hard to use no colour
57
advantages of electron microscope
higher magnification and resolution
58
order the units of conversion - low to high and name the things (3)(3)(2)(1)(1)
nanometre - glucose(0.1 - 0.5) - glucose (1) - virus (100) micrometre - bacteria, animal and plant cell (10-100) - hair (100) millimetre - insects - objects (mostly cm) metre - planes kilometre - mountain
59
how to work out the image size
Image size = object size x magnification
60
what is the definition of an endothermic reaction?
these are reactions that take energy from the surrounding to take place - e.g. LIGHT FROM SUN
61
In what part of the cell does photosynthesis take place?
In chloroplasts
62
What is the word equation for photosynthesis?
Carbon dioxide + water ➔ glucose + oxygen
63
What is the chemical symbol equation for photosynthesis?
6CO2 + 6H2O ➔ C6H12O6 + 6O2
64
Which type of reaction is photosynthesis?
Photosynthesis is an endothermic process because it requires energy (from the sun).
65
What can the glucose make during photosynthesis be used for?
- Stored as starch for later - Respiration
66
How do plants get the carbon dioxide required for photosynthesis?
It diffuses from the air into the leaves via stomata
67
How do plants get the water required for photosynthesis?
It diffuses from the soil into the root hair cells by osmosis
68
What makes starch a useful long term storage molecule?
- It can easily be broken down when needed - It is insoluble in water - It is compact
69
One use of glucose is to make amino acids. What else do plants need to make amino acids?
Nitrate ions
70
What are the main uses of glucose in plants? (5)
Cellular respiration - break down the glucose to release energy Make cellulose - which is used to make strong cell walls Make starch - which is used to store glucose for a later time Make amino acids - which are used to make proteins Make lipids - these store the energy as fats or oils for later use
71
What useful energy transfer or conversion happens overall in photosynthesis?
Light ➔ chemical Photosynthesis converts light energy from the sun into chemical energy in the chemical bonds of glucose molecules.
72
which cells are eukaryotic or prokaryotic
animal and plant - eukaryotic bacteria - prokaryotic

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