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Question
What changes occur at the time of birth?
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Solution
A cycle of uterine contractions followed by labour pains, dilation of the cervix and the vagina slowly pushes the fetus out of the uterus. The uterine contractions are initiated by decreased progesterone secretion and the secretion of oxytocin hormone by the pituitary gland. After the child's delivery, the placenta is expelled out.
RELATED QUESTIONS
The exact location of the Amnion
Name the following:
The body part in which the embryo develops.
Given below is the name of certain stage/substance related to reproduction and found in human body. Answer the questions related to it.
Placenta
- What are the two sources that form placenta?
- Name any two main substances which pass from foetus to mother through placenta.
- Name any two hormones it produces.
Name and describe very briefly, the stages in the development of human embryo.
Describe the functions of Amnion
Describe briefly the ways how a mammalian embryo is protected
Give Reasons
The full-grown human embryo respires but does not breathe.
Name the Following
How the embryo inside the uterus is protected from jerks or mechanical shocks.
A disc-like structure attached to the uterine wall that supplies food and oxygen to the foetus and removes waste is known as which of the following?
Which component of the placenta originates from the trophoblast of the blastocyst and is also called the chorion frondosum?
