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Questions and Answers
What happens to the follicles during the first 7 days of the menstrual cycle?
What is the primary function of the estrogen secreted by the follicles?
What happens to the egg right before ovulation?
What causes the follicle to have a growth spurt on Day 14?
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How long does the egg live after ovulation if it is not fertilized?
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What is the function of the cilia in the fallopian tube?
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What is the main reason why the estrogen is secreted into the bloodstream?
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What happens to the majority of the follicles around Day 7?
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Which hormone is released by the pituitary gland in response to estrogen?
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What is the role of the fallopian tube in the fertilization process?
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What happens to the follicle after it releases the egg into the abdominal cavity?
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What is the purpose of the chemicals released by the bulging follicle?
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What happens to the sperm if the egg is not fertilized within 12-24 hours?
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Study Notes
Ovarian Follicle Development
- Ovarian follicles start growing in the first 7 days of the menstrual cycle.
- These follicles secrete estrogen into the bloodstream to prepare the uterus lining for pregnancy.
Follicle Maturation
- By around day 7, all follicles stop growing and degenerate, except for one dominant follicle.
- The dominant follicle continues to grow and nourish the egg inside.
Estrogen and Luteinizing Hormone
- On day 12, the dominant follicle secretes estrogen into the bloodstream.
- When estrogen reaches the hypothalamus and pituitary gland, it triggers the release of luteinizing hormone from the anterior pituitary gland.
Ovulation
- On day 14, the luteinizing hormone causes the dominant follicle to have a growth spurt.
- Right before ovulation, the egg detaches from the follicle.
- The follicle releases chemicals that cause one of the fallopian tubes to move closer and surround the follicle.
- The follicle then swells and bursts open, releasing the egg into the abdominal cavity.
Fertilization
- Cilia move the egg to the entrance of the fallopian tube.
- Contraction in the fallopian tube pushes the egg towards the uterus.
- The egg lives for 12 to 24 hours after ovulation. If not fertilized, it will die.
Ovarian Follicle Development
- Ovarian follicles start growing in the first 7 days of the menstrual cycle.
- These follicles secrete estrogen into the bloodstream to prepare the uterus lining for pregnancy.
Follicle Maturation
- By around day 7, all follicles stop growing and degenerate, except for one dominant follicle.
- The dominant follicle continues to grow and nourish the egg inside.
Estrogen and Luteinizing Hormone
- On day 12, the dominant follicle secretes estrogen into the bloodstream.
- When estrogen reaches the hypothalamus and pituitary gland, it triggers the release of luteinizing hormone from the anterior pituitary gland.
Ovulation
- On day 14, the luteinizing hormone causes the dominant follicle to have a growth spurt.
- Right before ovulation, the egg detaches from the follicle.
- The follicle releases chemicals that cause one of the fallopian tubes to move closer and surround the follicle.
- The follicle then swells and bursts open, releasing the egg into the abdominal cavity.
Fertilization
- Cilia move the egg to the entrance of the fallopian tube.
- Contraction in the fallopian tube pushes the egg towards the uterus.
- The egg lives for 12 to 24 hours after ovulation. If not fertilized, it will die.
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Description
Learn about the growth and development of ovarian follicles during the menstrual cycle, including the role of estrogen and luteinizing hormone.
