Question

Secretory phase of human menstrual cycle is also called

• A. Follicular phase and lasts for 6 days
  
• B. Luteal phase and lasts for 13 days
  
• C. Follicular phase and lasts for 13 days
  
• D. Luteal phase and lasts for 6 days

Answer 1

The correct option is B Luteal phase and lasts for 13 days


Menstrual cycle
The cyclic changes that occur in the ovaries and the lining of the uterus in the female reproductive system of primates are called the menstrual cycle. Examples include humans, monkeys, etc.

Phases of the menstrual cycle
The menstrual cycle consists of three phases as follows:
1)Menstrual /bleeding phase
2)Follicular or proliferative phase
3)Luteal or secretory phase

Follicular or proliferative phase
The follicular or proliferative phase lasts for about 7 - 8 days.
1)In this phase the follicular cells mature and give rise to the Graffian follicle.
2)Endometrium becomes thicker by rapid cell multiplication, an increase of uterine glands, and blood vessels.
3)Rapid secretion of LH leading to its maximum level during the mid-cycle induces rupture of the Graffian follicle and thereby the release of the ovum (ovulation).

The secretory phase of the menstrual cycle
The luteal or secretory phase lasts for around 13 -14 days.
1)The ruptured Graafian follicle changes to a corpus luteum which releases progesterone and estrogen.
2)It stimulates the uterine glands to produce an increasing amount of watery mucus.
3)Progesterone helps in the maintenance of the endometrium.
4)This happens from the 15th to the 28th day.

Final answer
(B) Luteal phase and lasts for 13 days