The simultaneously occurring events during the menstrual cycle are:
1. | peak of LH secretion and menstrual flow |
2. | follicular development and the uterus becoming highly secretory |
3. | formation of corpus Albicans and an increase in progesterone secretion |
4. | Proliferation stage of the uterus and increased estrogen production |
Which one of the following is the most likely reason for the regular menstruation cycle not occurring in females?
1. | Fertilisation of the ovum |
2. | Maintenance of the hypertrophical endometrial lining |
3. | Maintenance of a high concentration of sex hormones in the bloodstream |
4. | Retention of well-developed corpus luteum |
What maintains the corpus luteum after fertilization?
1. | release of HCG by the trophoblast to maintain the corpus luteum. |
2. | production of LH by the maternal pituitary. |
3. | maintenance of the corpus luteum by prolactin. |
4. | production of estrogen by the adenohypophysis. |
Column I | Column II | |
1. | Ovulation | LH and FSH attain peak levels and sharp fall in the secretion of progesterone |
2. | Proliferative phase | Rapid regeneration of myometrium and maturation of Graafian follicle |
3. | Development of corpus luteum | Secretory phase and increased secretion of progesterone |
4. | Menstruation | Breakdown of myometrium and ovum not fertilized |
Which part of the ovary in mammals acts as an endocrine gland after ovulation?
1. | Graafian follicle | 2. | Stroma |
3. | Germinal epithelium | 4. | Vitelline membrane |
During a menstrual cycle, which of the following hormones reaches its maximum peak secretion level during the luteal phase of the cycle?
1. | FSH | 2. | LH |
3. | Estrogen | 4. | Progesterone |
The direct cause of ovulation during the menstrual cycle is:
1. | A sharp fall in the levels of estrogen |
2. | A dramatic rise in the secretion of FSH |
3. | The beginning of the secretion of progesterone |
4. | A surge in the secretion of LH |
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
1. | Release of egg: 5th day |
2. | Endometrium regenerates: 5 - 10 days |
3. | Endometrium secretes nutrients for implantation: 11-18 days |
4. | Rise in progesterone level: 1 - 15 days |
I: | During pregnancy, there is no menstruation. |
II: | Corpus luteum degenerates early in the event of fertilization |