Home
Class 12
BIOLOGY
Assertion: Vigorous contraction of the u...

Assertion: Vigorous contraction of the uterus at the end of pregnancy causes expulsion.
Reason: The stimulatory reflex between the uterine contraction and oxytocin secretion results in weakening contractions.

A

(1) X - Vagina , Y - Fertilisation

B

(2) X - Uretrus , Y - Pregnancy

C

(3) X - Placenta, Y - Implantation

D

(4) X - Embryo , Y - Ovulation

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

Name the hormone that causes uterine contraction

In females, vigorous contraction of uterus at the time of child birth and milk ejection from the mammary gland is due to

Assertion : Muscle contraction force increases with rise in strength of stimulus. Reason: This is due to increased contraction of individual muscle fibres with increases in stimulus strength.

Oxytocin, a peptide hormone from hypothalamus, has all the following effects except A. Stimulates vigorous contractions of the uterus at the time of child birth B. Its hypersecretion causes Cushing's syndrome C. Stimulates milk ejection from mammary glands D. Its synthetic form is often given to induce labor

Assertion : In muscle contraction, length of both A-bands and I-bands decrease. Reason : Both myosin of A-band and actin of I-bands are contractile proteins and decrease in size during muscle contraction.

Assertion:Extensor muscles of the back in man are red muscles. Reason:They are undergo slow sustained contraction for long periods.

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