Question

The phase of menstrual cycle in humans, that lasts for 3 - 5 days is

• A. Follicular phase
• B. Ovulatory phase
• C. Luteal phase
• D. Menstruation

Answer 1

Answer: (D)

Menstruation

The rhythmic reproductive cycle in the female primates is called as the menstrual cycle. The first menstruation begins at puberty and is called as menarche and is repeated at an average interval of about 28 / 29 days.

The major phases of the menstrual cycle are- menstrual phase, follicular phase and luteal phase. The cycle starts with the menstrual phase, when menstrual flow occurs and it lasts for 3-5 days. The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood vessels, which forms liquid, that comes out through vagina. Menstruation only occurs if the released ovum is not fertilised. Lack of menstruation may be indicative of pregnancy. Thus, the correct answer is option D.