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Biology > 6.6 Menstrual cycle > Flashcards

6.6 Menstrual cycle Flashcards

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1
Q

What hormone stimulates estrogen secretion in follicular phase?

A

FSH

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2
Q

What hormone stimulates LH secretion?

A

Estrogen

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3
Q

What hormones inhibits the secretion of LH and FSH?

A

Progesterone and estrogen

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4
Q

What hormone stimulates progesterone secretion?

A

LH

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5
Q

Where is FSH and LH secreted from?

A

The anterior pituitary

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6
Q

Where is progesterone and estrogen secreted from?

A

The ovaries

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7
Q

What hormone stimulates follicular growth?

A

FSH

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8
Q

What hormone stimulates the development of endometrium?

A

Estrogen

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9
Q

What hormone stimulates the thickening of endometrium?

A

Progesterone

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10
Q

What phase is the secretion of LH and FSH inhibited?

A

Luteal phase

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11
Q

Hormone that causes corpus luteum?

A

LH

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12
Q

Hormone where surge causes ovulation?

A

LH

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13
Q

What happens in follicular phase?

A
  • FSH stimulates growth of several follicles
  • Dominant follicle secretes estrogen
  • Estrogen inhibits growth of other follicles (and FSH)
  • Estrogen stimulates development of endometrium
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14
Q

What happens in ovulation?

A
  • A surge in LH causes ovulation

- Rupturing of follicle creates a corpus luteum

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15
Q

What happens in luteal phase?

A
  • Corpus luteum secretes progesterone and estrogen
  • Progesterone stimulates the development of endometrium
  • Progesterone and estrogen inhibits secretion of LH and FSH
  • Corpus luteum degrades over time
  • When corpus luteum degrades, progesterone levels drop
  • Without progesterone, endometrium cannot be maintained
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16
Q

What happens in ‘‘menses’’?

A
  • Endometrium is sloughed away

- No longer inhibited, FSH can start menstrual cycle again

17
Q

What happens if fertilisation occurs?

A

The zygote releases a hormone (hCG) which maintains the corpus luteum

18
Q

List three roles of testosterone in males

A
  • Pre-natal development of male genitalia
  • Development of secondary sex characteristics
  • Maintenance of sex drive (libido)

Biology (13 decks)

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