NEETZoologyHuman Reproduction
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): During parturition, the initial signals for uterine contractions do not originate from the maternal pituitary gland. Reason (R): The signals for parturition originate from the fully developed foetus and the placenta, inducing the foetal ejection reflex. In the light of the above statements, choose
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is true. The initial signals for parturition do not originate from the maternal pituitary gland. Reason (R) is also true and correctly explains the Assertion. According to NCERT, the signals for parturition originate from the fully developed foetus and the placenta. These signals induce mild uterine contractions called the foetal ejection reflex. This reflex then triggers the release of oxytocin from the maternal pituitary, which acts on the uterine muscle to cause stronger contractions. Thus, the mat