B1 Understanding Ourselves COMPLETE Flashcards Preview

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Flashcards in B1 Understanding Ourselves COMPLETE Deck (78)
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What does being heathy mean

Being free of infections or disease

1

What does it mean to be fit

It's a measure of how well you can perform physical tasks

2

How is the blood pumped around the body?

It is under pressure
It flows through arteries

3

How is blood pressure measured?

Mm of mercury

4

How can your blood pressure be increases

Smoking
Overweight
Too much alcohol
Stress

5

What can high blood pressure do to you?

Blood vessels burst

6

What does carbon monoxide do to the body?

Combines with haemoglobin to reduce amount of oxygen

High blood pressure

7

What does nicotine do to the body?

Increased heart rate and blood pressure

8

What do saturated fats do?

Cause a build up of cholesterol in arteries and plaque In the walls
Restricts blood flow and leads to a heart attack

9

What is carbohydrates function?

Energy

10

Fats fiction

Energy store and insulation

11

Protein fiction

Growth and repair

12

Vitamins and minerals function

Vitamin c prevents scurvy
Iron for haemoglobin

13

Waters function in the body

To prevent dehydration

14

What makes up a carbohydrate

Simple sugars such a glucose

15

What makes up fats

Fatty acids and gycerol

16

What makes up proteins

Amino acids

17

Too little protein causes

Kwashiorkor

18

How to calculate ear

0.6 x body mass

19

Name two eating disorders

Anorexia leads to self starving
Bulimia is binge eating then vomiting

20

What does bmi indicate

If you are under or overweight

21

How to calculate bmi

Body mass in kg
--------------------
height squared

22

What causes infections disease

Pathogens

23

What does fungi cause

Athletes foot

24

What does bacteria cause

Cholera

25

What do viruses cause

Flu

26

What is a Protozoa

A single cell organism and dysentery is cause by it

27

How is malaria causes

Protozoa are parasites and live of other organisms host
The mosquito is the vector and carries the disease
It infects others by feeding on others such as biting humans for blood

28

What part of your body deals with pathogens

Immune system

29

3 lines of attack for white blood cells what a pathogen enters the body

1. Consume them
2. Produce antitoxins
3. Produce antibodies on suface

30

How can you prevent and treat disease

Immunisation

31

What is active immunity

The immune system makes its own antibodies

32

What is passive immunity

When he body has antibodies made my annother organism such as babies being breast fed.

33

What do antibiotics do

Kill bacteria but no viruses

34

What causes cancer

Cells dividing out of control

35

What does benign mean

A safe tumour that grown till there is no more room and it's not dangerrous

36

What is a malignant tumour

They are dangerous and data and stars throughout the body is not treated

37

What is a depressant drug?

Alcohol and solvents
Decrease brains activity and causing slow reactions and poor judgement

38

What's a stimulant

Nicotine ecstasy caffeine
Offsite if depressants
They increase brain activity

39

What does alcohol do the body

It's a depressant
Can be poisonous off too much to drank
It causes dehydration
Poor judgement, balance, speech and vision

40

What illness can smoking cause

Heart disease

Cancers

Cookers caugh
Low weight babies

41

How is heart disease cause

Carbon monoxide decreases oxygen to the heart

42

How is lung throat and oesophagus cancer caused

Tar collects in lungs and carcinogens collect and mutate DNA to cause malignant tumours

43

How is emphysema caused

Cilia in lungs and throat are damaged causing a cough

44

What does the cornea do

Refract light

45

What does the iris do?

Controls light entering the eye

46

What do rods in the eye do

Sense light

47

What do cones in the eye do?

Detect colour

48

How do we see distant objects

Ciliary muscles relax
Suspensor ligaments contact
Lens In a oval and less round shape

49

How do we see close objects

Ciliary muscles contact
Suspensor ligaments relax
Lens more round

50

What does binocular vision allow us to do

Judge depth

51

What does a reflex action mean

To stops you injuring yourself
You are unaware of the process

52

What are the7 steps of the central nervous system

Stimulus
Receptor
Sensory nerve
DNS
Motor neurone
Effector
Response

53

What do neurones do

Transmit info along the body with electrical impulses

54

What is homeostasis

It maintains a constant internal environment

55

What is negative feedback

A rise in body temp causes a response of lower temp
A change in environment cause a counteract response

56

What is the body optimum temp?

37 degrees Celsius

57

What happens when we get too hot

Hairs lie flat
Sweat
Blood vessels at the surface widen( vasodilation)

58

What happens when we get too cold

Hairs stand up
No sweat
Shivers
Blood vessels contacts vasoconstriction to keep body heat in

59

What happens if book glucose is too high

Insulin is added

60

What happens if blood glucose leves are too low

No insulin is added

61

What is insulin

It is a hormone and travels in the blood

62

What is type one diabetes

The pancreas produces little or no insulin and is controlled by injecting insulin

63

What is type two diabetes

The person because resistant to insulting and it's controlled through food and diet

64

Name a plant hormone

Auxin and it controls growth at roots and tips

65

Shoots are .....

Positively photrophic and grow to the light

66

Shots are negatively .....

Geotrophic name grow away form gravity and the ground

67

Roots are positivity ......

Geographic and grow towards gravity

68

Roots are negativity .....

Photrophic and grown aways form the light and sun

69

How can plant hormones be used commercially?

As selective weed killers
To grow cuttings form rooting powder
Ripening fruit
Controlling dormancy in seeds that won't germinate

70

What does a nucleus do?

Contains genetic info

71

Chromosomes come in what?

Pairs
We have 23

72

What do chromosomes carry

Genes and characteristics

73

A gene is a short what....

A short chromosome

74

What's an alleles?

A different version of the same gene

75

How is a dominant gene shown

A capital letter

77

What do faulty genes cause

Genetic disorders

78

how can you remember the 7 steps of the central nervous system

silly- stimulus
reckless-receptor
snails-sensory
never-nerve
desert-DNS
multiple-motor
neurotic-neurone
elephants-effector
religiously-recpetor