Which of the following cells during gametogenesis is normally dipoid?
Primary polar body
Spermatid
Spermatogonia
Spermatogonia
C.
Spermatogonia
Spermatogonium are produced from the undifferentiated primordial germ cells which divide continuously by mitosis to form diploid cells, i.e. primary spermatocyte. These are the precursors of sperms, (the haploid cells). Primary polar body, secondary polar body (in oogenesis) are produced after first meiotic division as haploid cells. Spermatids are haploid cells produced by second meiotic division of secondary spermatocytes (n).
he figures given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which one set of three parts out of A-F have been correctly identified.
C- Infundibulum, D -Fimbriae, E -cervix
D- oviducal funnel, E Uterus, F- cervix
A - Perimetrium, B - Myometrium, C -Fallopian tube
A - Perimetrium, B - Myometrium, C -Fallopian tube
A.
C- Infundibulum, D -Fimbriae, E -cervix
The fallopian tube is about 10-12 cm long and extends from the periphery of each ovary to the uterus. The part closer to the ovary is the funnel-shaped and is called infundibulum. The edges of the infundibulum possess finger - like projections called fimbriae, which helps is a collection of the ovum after ovulation. The uterus opens into the vagina through a narrow cervix.
If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from
epididymis to vas deferens
ovary to uterus
vagina to uterus
vagina to uterus
D.
vagina to uterus
Vasa efferentia (Ductuli efferences) are 10-20 fine tubules which connect rete testis with an epididymis (Ducus epididymis). The latter is a pair of ducts from each testis which is formed by union of its vasa efferendia. If the vasa efferentia get blocked, the sperms will not be transported from testis to epididymis.
The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for
escaping any possible compression by the visceral organs
providing more space for the growth of epididymis
Providing a secondary sexual feature for exhibiting the male sex
Providing a secondary sexual feature for exhibiting the male sex
D.
Providing a secondary sexual feature for exhibiting the male sex
The testes in humans are situated outside the abdominal cavity in scrotal sacs. This is because the temperature of scrotal sacs is 25o C less than internal body temperature.
Which of these is not an important component of initiation of parturition in humans?
Increase in oestrogen and progesterone ratio
Synthesis of prostaglandins
Release of oxytocin
Release of oxytocin
D.
Release of oxytocin
Parturition is the birth process; triggered by oxytocin which initiates uterine contractions. Prostaglandins are produced in response to oxytocin and CRH production. They are effective at causing uterine contractions at times. Oestrogen, progesterone levels marks the beginning of parturition.
Prolactin hormone is responsible for milk secretion at the end of pregnancy. It is not significant during the birthing or initiation of parturition process.
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