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HUMAN BIO > 2.2 > Flashcards

2.2 Flashcards

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1
Q

Female menstrual cycle , how long

A

Takes around 28 days

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2
Q

When does ovulation occur (day)

A

14 days into menstrual cycle

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3
Q

Two main phases of menstrual cycle

A

Follicular cycle (up to ovulation)
Luteal phase (ovulation to menstruation)

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4
Q

FSH stands for

A

Follicle Stimulating Hormone

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5
Q

LH stands for

A

Lutenising Hormone

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6
Q

What secretes FSH

A

Pituitary gland

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7
Q

What does FSH stimulate

A

Development of the follicle surrounding immature ova

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8
Q

Where is oestrogen produced

A

Ovary - Follicle

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9
Q

What does oestrogen stimulate

A

Growth of endometrium. High concentrations release LH

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10
Q

Where is LH produced

A

Pituitary gland

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11
Q

What does LH stimulate

A

Causes ovulation. Develops follicle bits into corpus luteum

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12
Q

Where is progesterone produced

A

Ovary - corpus luteum

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13
Q

What does progesterone stimulate

A

Causes more growth and vascularisation of endometrium. Higher concentrations inhibit LH and FSH.

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14
Q

What are hormones

A

Chemical messengers that travel in the blood

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15
Q

Releaser hormones in the hypothalamus activates two hormones in males ..

A

FSH - starts sperm production in seminiferous tubules
ICSH - causes interstitial cells to make testosterone

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16
Q

Releaser hormone in hypothalamus activates two hormones in females…

A

FSH - the ovaries produce follicles
LH - causes ovulation

17
Q

What does ICSH stand for

A

Interstitial cell stimulating hormone

18
Q

How does FSH act in males

A

Acts on seminiferous tubules to promote sperm production

19
Q

How does ICSH act in males

A

Acts on interstitial cells to make them produce testosterone

20
Q

How does testosterone act in males

A

Acts on seminiferous tubules to produce sperm

21
Q

What does high levels of testosterone inhibit

A

High levels of testosterone inhibit production of FSH and ICSH in the pituitary

22
Q

Explain the negative feedback of testosterone

A

High levels of testosterone inhibits FSH and ICSH

Testosterone production reduced due to lack of ICSH

HUMAN BIO (24 decks)

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