Understanding the Menstrual and Estrous Cycles

What is the primary purpose of the menstrual cycle in females?

• To prepare the body for potential pregnancy

• To regulate body temperature

• To improve digestion

• To enhance physical strength

During which phase of the menstrual cycle does ovulation occur?

• Bleeding phase

• Secretory phase

• Proliferative phase

• Menstrual phase

Which hormone is primarily responsible for the thickening of the endometrium during the secretory phase?

• FSH

• Progesterone

• LH

• Estrogen

What role does GnRH play in the menstrual cycle?

• It directly causes ovulation

• It inhibits estrogen production

• It thickens the uterine lining

• It stimulates the release of FSH and LH

What happens to the corpus luteum if pregnancy does not occur?

• It releases FSH

• It continues to grow

• It degenerates

• It becomes a permanent structure

Which hormone is responsible for maintaining the endometrium during early pregnancy?

• GnRH

• HCG

• LH

• FSH

At what age range does menarche typically occur?

• 5-7 years

• 11-13 years

• 18-20 years

• 25-27 years

What is menopause?

• A temporary pause in menstruation

• A phase of increased fertility

• The end of the menstrual cycle

• The beginning of the menstrual cycle

How does the estrous cycle differ from the menstrual cycle?

• It has no hormonal regulation

• It includes a reabsorption of the uterine lining

• It involves a continuous sexual receptivity

• It occurs in primates only

During which phase of the estrous cycle does the female become receptive to the male?

• Anestrus

• Proestrus

• Estrus

• Metestrus