B5 - Homeostasis

Question 1

What does a negative feedback system do?

Answer 1

Counteract change

Question 2

What are the 4 components of the nervous system?

Answer 2

CNS
Sensory neurones
Motor neurones
Effectors

Question 3

What are 3 ways to correct vision defects?

Answer 3

1 - contacts
2 - laser eye surgery
3 - replacement lens surgery

Question 4

What are the 3 ways to study the brain?

Answer 4

1 - studying patients with brain damage
2 - electrically stimulating the brain
3 - MRI scans

Question 5

What happens at the synapses between neurones?

Answer 5

Diffusion of chemicals

Question 6

How do the lenses adjust to view near objects?

Answer 6

Cillary muscles tighten, suspensory ligaments relax.

Question 7

How do the lenses adjust to view far objects?

Answer 7

Cillary muscles relax, suspensory ligaments tighten.

Question 8

How many stages does the female menstrual cycle have?

Answer 8

4

Question 9

What are the 4 hormones involved in the menstrual cycle?

Answer 9

FSH, LH, Oestrogen, Progesterone

Question 10

What does FSH do?

Answer 10

Stimulate oestrogen production

Question 11

What does oestrogen do?

Answer 11

Growth of lining + stims LH

Question 12

What does LH do?

Answer 12

Stims egg release

Question 13

What does progesterone do?

Answer 13

Inhibits LH + FSH

Question 14

What do kidneys filter from the blood?

Answer 14

Urea, ions/salts, water

Question 15

What does thyroxine do?

Answer 15

Controls metabolism

Question 16

What is urine concentration controlled by?

Answer 16

ADH

Question 17

How does ADH control urine concentration?

Answer 17

Causes kidneys to absorb more water.

Question 18

What are 3 plant hormones?

Answer 18

1 - auxine
2 - ethene
3 - gibberelins

Question 19

What does auxine do in shoots?

Answer 19

Causes the bottom cells of the plant to elongate so it stretches up to the sun?

Question 20

What causes the movement of shoots towards the sun?

Answer 20

Auxines/phototropism

Question 21

What does auxine do in roots?

Answer 21

Causes the upper cells to elongate to stretch the shoots down

Question 22

What causes the downward movement of roots?

Answer 22

Auxines/gravitropism

Question 23

What human organ does a dialysis machine assist/replace?

Answer 23

Kidneys

Question 24

How does your body handle too much glucose?

Answer 24

Adds insulin, which converts excess glucose into glycogen)

Question 25

How does your body handle too little glucose?

Answer 25

Adds glucagon

Question 26

What are 5 glands within the body?

Answer 26

``` 1 - pituitary 2 - thyroid 3 - adrenal 4 - pancreas 5 - ovaries/testes ```

Question 27

What differentiates T1D from T2D?

Answer 27

In T1D, insulin isn't produced at all, in T2D, blood becomes insulin resistant.

Question 28

What do the blood vessels do when it is too hot?

Answer 28

Blood vessels near skin dilate (vasodilation)

Question 29

What do the blood vessels do when it is too cold?

Answer 29

Blood vessels near skin constrict (vasoconstriction)

Question 30

What is found at the back of your brain?

Answer 30

Cerebellum

Question 31

What is found at the front of your brain (not frontal lobe)?

Answer 31

Medulla

Question 32

What is the largest part of your brain called?

Answer 32

Cerebral cortex