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Biology > B5 - Homeostasis > Flashcards

B5 - Homeostasis Flashcards

1
Q

What does a negative feedback system do?

A

Counteract change

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2
Q

What are the 4 components of the nervous system?

A

CNS
Sensory neurones
Motor neurones
Effectors

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3
Q

What are 3 ways to correct vision defects?

A

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

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4
Q

What are the 3 ways to study the brain?

A

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

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5
Q

What happens at the synapses between neurones?

A

Diffusion of chemicals

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6
Q

How do the lenses adjust to view near objects?

A

Cillary muscles tighten, suspensory ligaments relax.

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7
Q

How do the lenses adjust to view far objects?

A

Cillary muscles relax, suspensory ligaments tighten.

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8
Q

How many stages does the female menstrual cycle have?

A

4

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9
Q

What are the 4 hormones involved in the menstrual cycle?

A

FSH, LH, Oestrogen, Progesterone

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10
Q

What does FSH do?

A

Stimulate oestrogen production

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11
Q

What does oestrogen do?

A

Growth of lining + stims LH

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12
Q

What does LH do?

A

Stims egg release

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13
Q

What does progesterone do?

A

Inhibits LH + FSH

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14
Q

What do kidneys filter from the blood?

A

Urea, ions/salts, water

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15
Q

What does thyroxine do?

A

Controls metabolism

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16
Q

What is urine concentration controlled by?

A

ADH

17
Q

How does ADH control urine concentration?

A

Causes kidneys to absorb more water.

18
Q

What are 3 plant hormones?

A

1 - auxine
2 - ethene
3 - gibberelins

19
Q

What does auxine do in shoots?

A

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

20
Q

What causes the movement of shoots towards the sun?

A

Auxines/phototropism

21
Q

What does auxine do in roots?

A

Causes the upper cells to elongate to stretch the shoots down

22
Q

What causes the downward movement of roots?

A

Auxines/gravitropism

23
Q

What human organ does a dialysis machine assist/replace?

A

Kidneys

24
Q

How does your body handle too much glucose?

A

Adds insulin, which converts excess glucose into glycogen)

25
Q

How does your body handle too little glucose?

A

Adds glucagon

26
Q

What are 5 glands within the body?

A 
1 - pituitary
2 - thyroid
3 - adrenal
4 - pancreas
5 - ovaries/testes
27
Q

What differentiates T1D from T2D?

A

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

28
Q

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

A

Blood vessels near skin dilate (vasodilation)

29
Q

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

A

Blood vessels near skin constrict (vasoconstriction)

30
Q

What is found at the back of your brain?

A

Cerebellum

31
Q

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

A

Medulla

32
Q

What is the largest part of your brain called?

A

Cerebral cortex

Biology (3 decks)

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