In an experiment, rats' ovaries were removed immediately after impregnation and then the rats were divided into two groups. Treatments and results are summarized in the table. The results most likely occurred because progesterone exerts an effect on the
A)general health of the rat.
B)size of the fetus.
C)metabolism of the uterus.
D)gestation period of rats.
E)number of eggs fertilized.

Question

In an experiment, rats' ovaries were removed immediately after impregnation and then the rats were divided into two groups. Treatments and results are summarized in the table. The results most likely occurred because progesterone exerts an effect on the
A)general health of the rat. 
B)size of the fetus. 
C)metabolism of the uterus. 
D)gestation period of rats. 
E)number of eggs fertilized.

Quizplus · Accepted Answer

Progesterone is known to have an effect on the metabolism and growth of the uterus, which would explain the larger size of the fetuses and the increased weight of the uterus observed in the rats that were treated with progesterone. This hormone plays a critical role in pregnancy by preparing the uterus for implantation and supporting the growth of the developing fetus.

In an Experiment, Rats' Ovaries Were Removed Immediately After Impregnation