Multiple Choice QuestionsWhich extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Chorion
Allantois
Yolk sac
Amnion
In human, during fertilization, a sperm firstly comes in contact with which layer of the ovum
Zona pellucida
Vitelline membrane
Jelly coat
Zona radiata
Due to alcohol abuse, brain-related disease Korsakkoff’s syndrome occurs. Which nutrient is responsible for this syndrome?
Vitamin-B12
Fat
Protein
Vitamin-B1
The number of chromosomes in a primary spermatocyte is
Same as in spermatid
Same as in spermatogonium
Help of that in spermatogonium
Same as in secondary spermatocyte
How many sperm cells are present in an average (3 mL) ejaculation?
200 million
300 million
400 million
500 million
LH and FSH are collectively called
oxytocin
samatotrophins
luteotropic
gonadotropins
D.
gonadotropins
Gonadotropins or Gonadotropic hormones are those which stimulate the gonads, ie, testes and ovaries.
FSH or Follicle Stimulating Hormone stimulates the growth of ovarian follicles and the secretion of oestrogens in the females and spermatogenesis in males.
LH or Luteinizing Hormone stimulates the corpus luteum of the ovary to secrete progesterone in the females. In males, it activates the Leydig's cells of the testis to secrete androgens.
Somatotropins or Somatotropic Hormone or Growth Hormone stimulates growth directly.
Luteotropic Hormones stimulates the corpus luteum of the ovary to secrete progesterone hormone. Also called Mammotropin Hormone (MTH) or Prolactin Hormone (PRL) as it activates growth of breast during pregnancy.
Oxytocin is secreted by posterior lobe of pituitary. It promotes contraction of the uterine muscle and myoepithelial cells of the lactating breast. Also called birth hormone and milk ejecting hormone.
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