Question

(i) Where do the signals for parturition originate from, in humans ?

(ii) Why is it important to feed newborn babies on colostrum ?

Hint:

Signals come from the foetus and placenta; colostrum gives the baby antibodies.

Answer 1

Step 1: Part (i): origin of the signals:
The signals for parturition come from the fully developed foetus and the placenta.
They cause mild uterine contractions, known as the foetal ejection reflex. This leads to the release of oxytocin from the maternal pituitary.

Step 2: Part (ii): why colostrum:
Colostrum is the yellowish milk produced in the first few days after delivery. It is rich in antibodies (IgA).
These antibodies give the newborn passive immunity, so the baby develops resistance against infections.

Final Answer:
Parturition signals come from the foetus and placenta; colostrum provides antibodies to the newborn.