Question

human chorionic gonadotropin (hcg)_________.
a maintains the corpus luteum until the placenta is secreting hormones
b is used to detect pregnancy
c keeps a new follicle from developing
d all apply.

Explanation:

• Option A: After implantation, HCG maintains the corpus luteum. The corpus luteum secretes progesterone which is crucial for maintaining the endometrium. Later, the placenta takes over the hormone - secreting function.
• Option B: HCG is detected in urine or blood in pregnancy tests. Its presence indicates pregnancy.
• Option C: By maintaining high levels of progesterone (through the corpus luteum it supports), HCG inhibits the development of new follicles (as the hormonal environment is set for pregnancy rather than a new menstrual cycle).

Since all of the above - mentioned functions (A, B, and C) are true for HCG.

Answer:

D. All apply.