The following is the illustration of the sequence of ovarian events (a − i) in a human female
(i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.
(iii) Explain the changes that occur in the uterus simultaneously in anticipation.
(iv) Write the difference between ‘c’ and ‘h’.
(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.
Answers
Explanation:
- (f) represents ovulation
- ovarian hormone- estrogen
pituitary hormone- LH(ovulation) and FSH(maturation)
Steps of fertilization in human
Explanation:
(i) Figure 'F' illustrates ovulation. The stage of oogenesis that it represents is the ovulatory stage.
(ii) The ovarian hormone and the pituitary hormone that has caused the above-mentioned event are Progesterone (Ovarian hormone) and Follicle Stimulating Hormone (FSH) and Luteinising Hormone (LH) - pituitary hormone.
(iii) The changes that occur in the uterus simultaneously in anticipation is that the endometrium lining of the uterus gets thickened as well as there is an increase in blood supply to the endometrium.
(iv) 'C' represents the secondary follicle while 'H' represents the corpus luteum.
Difference between the two is as follows:
a) The secondary follicle has the theca layer while the corpus luteum does not have it.
b) Layer of granulosa cells are available in the auxiliary follicle yet missing in the corpus luteum.
(v) Labeled sketch of the structure of a human ovum prior to fertilization is as follows -
