In humans, at the end of the first meiotic division, the male germ cells differentiate into the
Primary spermatocytes
Secondary spermatocytes
spermatids
spermatids
B.
Secondary spermatocytes
At sexual maturity, the germ cells in human male divide several times by mitosis to produce a large number of spermatogonia. In the growth phase, each spermatogonium actively grows to a larger primary spermatocyte by obtaining nourishment from the nursing cells. In maturation phase, each primary spermatocyte undergoes two successive division called maturation divisions. The primary spermatocyte undergoes first maturation division (meiotic) to producing tow haploid daughter cells called secondary spermatocytes undergo second maturation division to form four haploid spermatids. The transformation of spermatids into spermatozoa is called spermiogenesis or spermateliosis.
Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Chorion
Allantois
Yolk sac
Yolk sac
Seminal plasma in human is rich in
fructose, calcium and certain enzymes
fructose and calcium but has no enzymes
glucose and certain enzymes but has no calcium
glucose and certain enzymes but has no calcium
The correct sequence of spermatogenetic stages leading to the formation of sperms in mature human testis is
spermatocyte-spermatoogonia-spermatid-sperms
spermatogonia-spermatocyte-spermatid
spermatid-spermatocyte-spermatogonia-sperms,
spermatid-spermatocyte-spermatogonia-sperms,
In human adult females, oxytocin
is secreted by the anterior pituitary
stimulates the growth of mammary glands
stimulates pituitary to secrete vasopressin
stimulates pituitary to secrete vasopressin
