Question

1-The only ovarian hormone that dose not have an inhibiting control over other hormone is?

a) Estrogens, b) Relaxin, c) Inhibin, d) hCG, Progesterone

2-Which of the following statement is false?

a) During embryogenesis, the three individual germ layers occurs during gastrulation

b) Embryonic cleavage happens in the first week of development

c) The trophoblast will become the placenta

d) Cleavage results in multiple cells that are the same as the original cell

e) The yolk sac develops in the second week of development

3-The intervillous spaces of the placenta_________

a) Are derived from the yolk sac

b) Are derived from the Amnion

c) Contain maternal blood

d) Are derived from the chorion

e) Contain fetal blood

4-An embryo develops into a normal baby girl because it __________

a) Lack the SRY gene

b) Received two X chromosome from its mother

c) Lack mesonephric duct

d) Is exposed to very high levels of estrogen during development

Lack paramesonephric duc

Answer 1

1. Relaxin is the ovarian hormone that dose not have an inhibiting control over other hormones. The other hormones have inhibiting control such as estrogen inhibits progesterone and hCG and vice versa. Inhibin acts to inhibit the secretion of follicle stimulating hormone (FSH).

2. The yolk sac develops in the second week of development - this statement is false because yolk sac generally develops after five weeks of gestation.

3. The intervillous spaces of placenta contain maternal blood​​​​​​ which supplies nutrition to the foetus.

4. An embryo develops into a normal baby girl because it lack SRY gene. An embryo develops into female child by default. When SRY gene present in the embryo, it develops into male child.