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Assertion (A): Parturition is induced by...

Assertion (A): Parturition is induced by a complex neuro endocrine mechanism.
Reason (R ): At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

A

Both A and R are true and R is the correct explanation of A

B

Both A and R are true and R is not the correct explanation of A

C

A is true but R is false

D

A is False but R is true

Text Solution

Verified by Experts

The correct Answer is:
C
Parturition is induced by a complex neuro-endocrine mechanism. It is signalled by fully developed foetus and placenta, known as Foetal Ejection Reflex.
Foetal ejection reflex triggers Oxytocin release from maternal pituitary which causes stronger uterine contractions.
Prolactin plays a key role in inducing lactation from the mammary glands.
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Assertion: Parturition is induced by neural signal in maternal pituitary. Reason: At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

Given below are assertion and reason . Point out if both are true with reason being correct explanation (A). Both true but reason is not correct explanation (B), assertion true but reason is wrong (C ), both are wrong (D). Assertion: Parturition is induced by neural signal in materianl pituitary . Reason: At the end of gestation period. the maternal pituitary releases productin whichcauses uterine contractions.

Read following statements (a-d) and choose the option with only correct statements. a. Parturition occurs due to a complex neuroendocrine mechanism at the end of gestation period. b. The signals for parturition originate from fully developed foetus and placenta which induces mild uterine contraction. c. Foetal ejection reflex triggers release of oxytocin from foetal pituitary. d. Oxytocin reduces uterine contraction under positive feedback control and causes expulsion of placenta followed by foetus known as parturition. a and b b and c c and d a and d

Which of the following endocrine glands is responsible for the release of hormones which cause uterine contractions during childbirth ?

(A) : The process of delivery of the foetus is called parturition. (R) : It is induced by a complex neuro-endocrine mechanism.

Assertion (A) : An alternator is machine which converts mechanical energy into electrical energy. Reason (R) : When a coil rotates in a magnetic field an e.m.f. is induced in it.

Assertion (A): Oxytocin helps in parturition. Reason (R): Oxytocin acts on uterine muscle and causes expulsion of the foetus.

A : Corticotrophin releasing hormone is a a part of the clock that establishes the timing of birth . R : The signals for parturition originate from the fully developed foetus and placenta which induce mild uterine contractions called foetal ejection reflex .

Given below are the steps involved in parturition. Arrange them in proper sequence and select the correct option. I. The induction of mild uterine contractions is called foetal ejection reflex. II. Stronger uterine contractions causing the further release of oxytocin. III. Origination of signals from the fully developed foetus and placenta. IV. Release of oxytocin from maternal pituitary V. Expulsion of baby from the birth canal

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