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Normal OB > Lesson 2A (Part 3) > Flashcards

Lesson 2A (Part 3) Flashcards

1
Q

What are estrogen and progesterone produced by?

A

The ovairies

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2
Q

What is the hormonal cycle controlled by?

A

Feedback loops

- positive and negative

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3
Q

Negative feedback loops (3)

A
  1. Increase levels of estrogen
  2. Inhibition of GnRH in the hypothalamus
  3. Decreases levels of FSH and LH
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4
Q

Positive feedback loops (3)

A
  1. Decreases levels of estrogen
  2. GnRH production in the hypothalamus increases
  3. Increases levels of FSH and LH
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5
Q

What is the target cells for GnRH?

A

Anterior pituitary

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6
Q

What is the target cells for FSH?

A

Ovarian follicles

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7
Q

What is the target cells for LH? (2)

A
  1. Ovarian follicles

2. Corpus luteum

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8
Q

What is the target cells for estrogen? (6)

A
  1. Breast
  2. Vagina
  3. Uterus
  4. Bone
  5. Fallopian tubes
  6. Placenta
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9
Q

What is the target cells for progesterone?

A

The endometrium

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10
Q

What are the days for the menstrual cycle?

A

Days 1-5

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11
Q

What are the levels of estrogen and progesterone during the menstrual cycle?

A

Low

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12
Q

Why are the levels of estrogen and progesterone during the menstrual cycle low? (2)

A
  1. The corpus luteum became the corpus albican and it does not produce those hormones anymore
  2. It initiates positive feedback to the hypothalamus to increase levels of GnRH, FSH and LH
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13
Q

How many days is there between menses and ovulation?

A

9 days

- 5-13 days

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14
Q

What happens during days 5-13? (3)

A
  1. Growing follicles produce estrogen
  2. High levels of estrogen lead to endometrial thickening
  3. FSH causes maturation of dominant follicle into Graafian follicle
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15
Q

What day does ovulation occur?

A

Day 14

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16
Q

What does LH stimulate?

A

Formation of the corpus luteum from the collapsed dominant follicle

17
Q

What happens from day 15-28? (3)

A
  1. Corpus luteum produces progesterone and estrogen
    - endometrium continues to thicken
  2. High levels of progesterone and estrogen
    activate negative feedback to hypothalamus and anterior pituitary gland
    - no FSH and LH
  3. Corpus luteum degenerates if fertilization doesn’t occur
    - lower levels of estrogen and progesterone resulting in the break down of the endometrium

Normal OB (18 decks)

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