Cervix is a part

Placenta is formed in humans by

Solution

Human placenta is largely formed of chorion and contains blood vessels formed by allantois.

Which one of the following is the precise site of embryo implantation in a normal pregnancy ?

Solution

This is the capillary-rich inner wall of the uterus, where implantation is accomplished for the developing human embryo.

Gestation period is the duration between

In human adult females oxytocin:

After which cell division Spermatogonia are formed?

Which one of the following describes the correct sequence of stages during embryogenesis?

Solution

The zygote initially undergoes cleavage until the blastula stage is reached. Gastrulation is a drammatic rearrangement of the cells of the blastula.

Identical twins result when

the zygote divides and the daughter cells split and develop independently.
two eggs with identical genetic material are fertilized, each by a different sperm.
an embryo splits before cellular differentiation has occurred.
Both (a)and (c)

Solution

If an embryo splits before cell fate has been determined,identical twins may result.

An important factor contributing to the onset and maintenance of labour contractions is

Which of the following statements about human pregnancy and foetal development is false ?

The blastocyst is a stage in foetal development that appears early during the third trimester.
A vital connection between the foetal and maternal blood supplies occurs at the placenta.
Most of the growth in foetal size occurs during the second and third trimesters.
All major organ systems have formed by the end of the foetus’s first three months of life.

Solution

The blastocyst is one of the very first stages in human embryonic development, occurring early in the first trimester.

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