Question

The expulsion of the fully developed foetus in human female is induced by the following EXCEPT:

• A. The signals from fully developed foetus for uterine contraction.
• B. The secretion of corticosteroids from adrenal gland.
• C. The increase in the level of hCG.
• D. The secretion of ACTH by fully developed foetus.

Hint:

Parturition is started by foetal signals and hormones such as ACTH, corticosteroids and oxytocin. hCG is a hormone of early pregnancy.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Parturition is started by signals from the fully grown foetus and the placenta that cause mild uterine contractions.

Step 2: Hormones involved
The foetal pituitary releases ACTH, which makes the foetal adrenal cortex secrete corticosteroids. These raise the oestrogen to progesterone ratio. Oxytocin from the mother then causes strong contractions.

Step 3: hCG
hCG is secreted mainly in early pregnancy to maintain the corpus luteum, and its level does not increase at the time of birth.

Final Answer:
An increase in hCG level does not induce parturition. \[ \boxed{\text{(C) }\text{The increase in the level of hCG.}} \]