Multiple Choice QuestionsWhich one of the following statements with regard to embryonic development in humans is correct?
Cleavage divisions bring about considerable increase in the mass of protoplasm
In the second cleavage division, one of the two blastomeres usually divides a little sooner than the second
With more cleavage divisions, the resultant blastomeres become larger and large
Cleavage division results in a hollow ball of cells called morula
Secretion of androgens by testes is regulated by:
LTH
FSH
ICSH
Oxytocin
C.
ICSH
Testosterone, and dihydrotestosterone are secreted by testes collectively known as androgens. Secretion of androgens by testes is regulated by interstitial cell stimulating hormone (ICSH). It is a luteinizing hormone (LH).
LTH stands for luteotropic hormone. It is a substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity. It is produced by the pituitary gland of mammals.
Follicle-stimulating hormone or FSH is a gonadotropin, a glycoprotein polypeptide hormone. It is synthesized and secreted by the gonadotropic cells of the anterior pituitary gland, and regulates the development, growth, pubertal maturation, and reproductive processes of the body.
Oxytocin or Oxt is a peptide hormone and neuropeptide. It is produced by the para- ventricular nucleus of the hypothalamus and released by the posterior pituitary. It plays a role in social bonding, sexual reproduction, childbirth, and the period after childbirth.
During a woman's life time, she produces about:
40-50 eggs
300-350 eggs
400-500 eggs
750-850 eggs
The production and maturation of sperm in testes is known as :
oogenesis
sporogenesis
gametogenesis
spermatogenesis
The phase of menstrual cycle in humans that lasts for 7-8 days, is :
menstruation
luteal phase
ovulatory phase
follicular phase
Which one of the following statement with regard to the embryonic development in humans is correct ?
Cleavage results in a hollow balls of cells called morula
Cleavage in mammalian ova is unequal holoblastic and horizontal
Rearrangement of blastomeres, a central cavity is formed inside the morula
Cleavage bring about considerable increase in the mass of protoplasm
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