Question

The immediate cause of induction of ovulation in human females is the large plasma surge of?

• A. FSH
• B. Estradiol
• C. LH
• D. Progesterone

Answer 1

The correct option is C

LH

The correct option is C.

Explanation of correct option:

1. The pituitary gland, which is located beneath the brain, produces LH hormone.
2. LH targets the ovary. Ovulation occurs during the Luteal phase of the ovarian cycle, which is brought on by an increase in LH.
3. LH act on a Graafian follicle i.e. a fully matured follicle having the secondary oocyte or female egg.
4. When LH surge occurs Graafian follicle gets ruptured and the female egg is released.
5. The ruptured Graafian follicle is now called the corpus luteum, which secretes progesterone.

Explanation of incorrect options:

Option A:

1. FSH stands for follicle stimulating hormone.
2. The anterior pituitary gland produces it.
3. It promotes the development of female follicles and male sperm in the testes.
4. It also induces the release of sex hormones.
5. Hence, it is an incorrect option.

Option B:

1. Estradiol is a hormone whose chemical nature is steroids.
2. Its primary role is to keep the menstrual cycle in order.
3. Hence, it is an incorrect option.

Option D:

1. Progesterone: The ovary and corpus luteum produces progesterone.
2. This hormone supports pregnancy
3. This hormone also acts on the mammary gland and stimulates them to form alveoli and secrete milk.
4. Hence, it is an incorrect option.

Final answer: Therefore, the immediate cause of induction of ovulation in human females is the large plasma surge of the luteinizing hormone LH.