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Biology Unit 5 > Feedback Mechanisms > Flashcards

Feedback Mechanisms Flashcards

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1
Q

What is negative feedback?

A

Occurs when the feedback causes the corrective measures to be turned off

Returning to a normal/original level

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2
Q

Examples of negative feedback

A

Control of body temperature

Control of blood glucose

Control of the oestrous cycle

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3
Q

What is positive feedback?

A

Occurs when the feedback causes the corrective measures to remain turned on

Systems deviate from the original level even more

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4
Q

What does FSH do?

A

Follicle-stimulating hormone - pituitary gland

Stimulates the development of follicles in the overt

Stimulates the ovaries to produce oestrogen

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5
Q

What does LH do?

A

Luteinising hormone - pituitary gland

Causes ovulation to occur

Stimulates ovaries to produce progesterone from the corpus luteum

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6
Q

What oestrogen do?

A

Causes the rebuilding of the uterus lining

Stimulates the production of LH

Inhibits the production FSH

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7
Q

What does progesterone do?

A

Maintains the lining of the uterus ready to receive a fertilised egg

Inhibits the production of FSH

Inhibits the production of LH

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8
Q

Day 1-5 of the menstrual cycle

A

The uterus lining is shed

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9
Q

From day 1 of the menstrual cycle

A

The pituitary gland releases FSH into the blood
Ovaries begin to grow and mature
These follicles release small amounts of oestrogen that builds up the lining and inhibits FSH and LH

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10
Q

Day 10 of the menstrual cycle

A

Oestrogen levels increase until day 10 stimulates more FSH AND LH to be released

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11
Q

Day 14 of the menstrual cycle

A

Ovulation occurs as a result of a surge of LH that causes an egg to be released

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12
Q

What happens after ovulation?

A

LH stimulates the empty follicle to develop into a corpus luteum and secrete progesterone

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13
Q

What happens if a egg isn’t fertilised?

A

The corpus luteum degenerates and progesterone is no longer released
The lining is no longer maintained and so breaks down
FSH is no longer inhibited and so is released
Cycle repeats itself

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14
Q

What is negative feedback?

A

Occurs when the feedback causes the corrective measures to be turned off

Returning to a normal/original level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Examples of negative feedback

A

Control of body temperature

Control of blood glucose

Control of the oestrous cycle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is positive feedback?

A

Occurs when the feedback causes the corrective measures to remain turned on

Systems deviate from the original level even more

17
Q

What does FSH do?

A

Follicle-stimulating hormone - pituitary gland

Stimulates the development of follicles in the overt

Stimulates the ovaries to produce oestrogen

18
Q

What does LH do?

A

Luteinising hormone - pituitary gland

Causes ovulation to occur

Stimulates ovaries to produce progesterone from the corpus luteum

19
Q

What oestrogen do?

A

Causes the rebuilding of the uterus lining

Stimulates the production of LH

Inhibits the production FSH

20
Q

What does progesterone do?

A

Maintains the lining of the uterus ready to receive a fertilised egg

Inhibits the production of FSH

Inhibits the production of LH

21
Q

Day 1-5 of the menstrual cycle

A

The uterus lining is shed

22
Q

From day 1 of the menstrual cycle

A

The pituitary gland releases FSH into the blood
Ovaries begin to grow and mature
These follicles release small amounts of oestrogen that builds up the lining and inhibits FSH and LH

23
Q

Day 10 of the menstrual cycle

A

Oestrogen levels increase until day 10 stimulates more FSH AND LH to be released

24
Q

Day 14 of the menstrual cycle

A

Ovulation occurs as a result of a surge of LH that causes an egg to be released

25
Q

What happens after ovulation?

A

LH stimulates the empty follicle to develop into a corpus luteum and secrete progesterone

26
Q

What happens if a egg isn’t fertilised?

A

The corpus luteum degenerates and progesterone is no longer released
The lining is no longer maintained and so breaks down
FSH is no longer inhibited and so is released
Cycle repeats itself

Biology Unit 5 (8 decks)

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