MLT GlobePhysiology: Reproductive physiology – page 2
25 Physiology MCQs on Reproductive physiology with answers and explanations.
In semen analysis, which gland contributes the largest share (about 60%) of the ejaculate volume, rich in fructose?
Seminal vesicle fluid is alkaline and fructose-rich and forms about 60% of semen. The prostate adds about 30% of thin, slightly acidic fluid; testicular sperm contribute very little volume.
During ejaculation, sperm are moved rapidly along the ductus deferens mainly by:
Thick smooth muscle of the ductus deferens contracts peristaltically under sympathetic control. Sperm tail motility matters later, within the female tract.
Which ovarian peptide hormone selectively inhibits pituitary FSH secretion?
Inhibin from granulosa cells feeds back mainly on FSH. Activin stimulates FSH; GnRH is hypothalamic and stimulates both FSH and LH.
About 6-7 days after fertilisation, which hollow structure with an inner cell mass implants into the endometrium?
The morula develops a fluid-filled cavity and becomes a blastocyst, whose trophoblast invades the endometrium. Gastrulation follows implantation, in week 3.
In late pregnancy, which steroid hormone does the placenta produce in large amounts to maintain the uterus?
After the first trimester the syncytiotrophoblast takes over progesterone production from the corpus luteum, keeping the myometrium quiescent. The placenta also makes oestrogens (mainly estriol).