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B. Answer the following questions.

1. What event is used to mark the start of the menstrual cycle?

2. Which hormones are released from the pituitary gland at the beginning of the cycle?

3. On what organ does FSH act?

4. Name 2 changes that occur in the ovaries as a result of rising FSH levels.

5. What does estrogen do to the lining of the uterus?

6. What signal in the blood reduces the production of FSH by the pituitary and limits the production of LH?

7. What signal later causes a rapid rise in the levels of FSH and LH?

8. When does ovulation usually occur?

9. What triggers ovulation?

10. After ovulation what happens to the ruptured follicle?

11. What causes this change?

12. What hormones are secreted by the corpus luteum?

13. What does the hormone progesterone do to the lining of the uterus?

14. What happens to the corpus luteum if the egg is not fertilized?

15. What triggers the start of menstruation if the egg is not fertilized?​

Sagot :

Unnieyanesgo

1. The menstrual cycle begins with menstrual bleeding (menstruation), which marks the first day of the follicular phase.

2.Therefore, the pituitary secretes FSH and LH, a process which actually begins before the onset of your menses.

3. Follicle stimulating hormone is produced by the pituitary gland.

4. Slowly rising levels of FSH and LH cause the growth of follicles on the surface of the ovary.

5. Estrogen causes the lining to grow and thicken to prepare the uterus for pregnancy.

6. It regulates the functions of both the ovaries and testes.

7. What signal later causes a rapid rise in levels of FSH & LH? High levels of estrogen.

8. In an average 28-day menstrual cycle, ovulation typically occurs about 14 days before the start of the next menstrual period.

9. Luteinizing hormone (LH), the other reproductive pituitary hormone, aids in egg maturation and provides the hormonal trigger to cause ovulation and the release of eggs from the ovary.

10.

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