Estrous Cycle Quiz

What is the estrous cycle?

• A period of sexual receptivity in mammalian females

• A phase of rapid growth in plants

• A cycle of lunar phases

• A period of hibernation in mammals

During which phase do ovarian follicles grow rapidly?

• Estrus

• Proestrus

• Metestrus

• Diestrus

Which phase is characterized by the corpus luteum forming from the corpus hemorrhagicum?

• Estrus

• Proestrus

• Metestrus

• Diestrus

What happens if no embryo is present during the estrous cycle?

• Progesterone levels increase

• The corpus luteum regresses

• Estrogen levels rise

• The corpus luteum remains intact

Which phase is absent in animals with short cycles?

• Estrus

• Proestrus

• Metestrus

• Diestrus

What is Anestrus?

• A phase of the estrous cycle

• A period of sexual inactivity between two periods of estrus

• The breeding season of the ewe, mare, and cat

• The time when the reproductive tract is most active

Which type of estrus cycle occurs in rabbits and other induced ovulators?

• Monoestrous cycle

• Polyestrous cycle

• Continuous estrus

• Seasonal polyestrous

How often do animals with a monoestrous cycle have an estrous cycle?

• Once per month

• Twice per year

• Once per year

• Every two years

What is the main characteristic of spontaneous ovulation?

• Requires mating stimulus

• Occurs only during pregnancy

• Is cyclic and does not require mating stimulus

• Happens only in induced ovulators

In which animals does spontaneous ovulation occur?

• Dogs, cats, and wolves

• Cows, sows, ewes, mares, rats, hamsters, and guinea pigs

• Rabbits and foxes

• Only in seasonal breeders