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Human Reproduction

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

In human adult females, oxytocin

  • is secreted by the anterior pituitary

  • stimulates the growth of mammary glands

  • stimulates pituitary to secrete vasopressin

  • causes strong uterine contractions during parturition


D.

causes strong uterine contractions during parturition

Oxytocin hormone is secreted from the posterior lobe of pituitary gland. It promotes contraction of the uterine muscle and myoepithelial cells of lactating breast, squeezing milk into the large ducts behind the nipple. Because of its role oxytocin is called birth hormone. 

The anterior lobe of pituitary gland secretes a somatotropic hormone, thyroid stimulating hormone, adrenocorticotropic hormone and gonadotropic hormones. 
The prolactin hormone or luteotropic hormone is secreted from the anterior lobe of pituitary gland. It activates the growth of breasts during pregnant and secretion of mammary glands after childbirth. 

Oxytocin hormone is secreted from the posterior lobe of pituitary gland. It promotes contraction of the uterine muscle and myoepithelial cells of lactating breast, squeezing milk into the large ducts behind the nipple. Because of its role oxytocin is called birth hormone. 

The anterior lobe of pituitary gland secretes a somatotropic hormone, thyroid stimulating hormone, adrenocorticotropic hormone and gonadotropic hormones. 
The prolactin hormone or luteotropic hormone is secreted from the anterior lobe of pituitary gland. It activates the growth of breasts during pregnant and secretion of mammary glands after childbirth. 

290 Views

Primary spermatocyte produces 4 spermatozoa, but primary oocyte produces :
  • 1 ovum
  • 2 ova
  • 3 ova
  • 4 ova

A.

1 ovum
1111 Views

The chromosone in primary spermatocyte are :
  •  22 + X 
  • 22+Y
  • 44 + XX
  • 44 + XY

D.

44 + XY
987 Views

Which of the following shows hermaphroditism and self fertilization ?
  • Earthworm
  • Tapeworm
  • Both A & B
  • Rotifers.

B.

Tapeworm
976 Views

The process of differentiation of spermatid into a spermatozoa is known as :
  • spermatogenesis
  • gametogenesis
  • spermiogenesis
  • oogenesis

C.

spermiogenesis
1502 Views

Ovulation takes place :
  • 2 weeks before the start of next menstrual cycle
  • 14th day of 28 days cycle
  • 10 days after the cease of previous monthly cycle
  •  All the above are correct.

B.

14th day of 28 days cycle
1177 Views