Arrange the following hormones in the sequence of their secretion in a pregnant woman.
Mention their source and the function they perform.
hcG ; LH ; FSH ; Relaxin (hPL)
(a) FSH, LH, hcG, (hPL)
(b)
hcG: If fertilization and implantation do occur, the corpus luetum is maintained by hcG, which takes the job of pituitary LH after fertilization.
Source: Placenta
LH: LH Act as the Leydigs cell and stimulates synthesis and secretion of androgens. Androgens stimulate the process of spermatogenesis.
In Females - FSH and LH affect the ovaries and uterus and the monthly cycle begins. Gonadotropins (LH and FSH) increase graually during the follicular phase and stimulates follicular development as well as secretion of estrogens by the following follicles.
Source: Anterior pituitary lob
FSH: It stimulate the follicles to produce estrogen and LH stimulates the corpus luetum to produce progestrone.
Source: Anterior pituitary lob
Relaxin (hPL): hcG, hPL and relaxin are produced in women only during pregnancy. In the later phase of pregnancy, a harmone called relaxin is also secreted by the ovary.
Source: Placenta
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________.