Human Physiology Multiple Choice Questions on “Chemical Coordination and Integration – Placenta”.
1. Portion of placenta contributed by the embryo is the ________
A. Chorion
B. Yolk sac
C. Amnion
D. Allantois
Answer: A
Clarification: Chorion is one of the membranes that surround the fetus while it is still being form. Chorion is contributed by the embryo.
2. Which vessel transports blood rich in oxygen and nutrients to the fetus?
A. Ductus arteriosus
B. Ductus venosus
C. Umbilical vein
D. Umbilical artery
View Answer
Answer: C
Clarification: The Umbilical vein is the vein present during fetal development that carries oxygenated blood from the placenta into the growing fetus.
3. The period immediately after birth to four weeks of age is called ___________
A. Senescent
B. Adolescent
C. Infancy
D. Neonatal
Answer: D
Clarification: Neonatal is pertaining to the newborn period, especially the first 4 weeks after birth.
4. In which menstrual cycle phase does implantation occur?
A. Menses
B. Ovulation
C. Secretory
D. Proliferative
Answer: C
Clarification: Secretory phase is the 2nd half of the menstrual cycle after ovulation. During the Secretory phase implantation occurs.
5. Which extra embryonic membrane encloses the embryo in a fluid filled cavity?
A. Allantois
B. Chorion
C. Amnion
D. Yolk sac
View Answer
Answer: C
Clarification: Amnion is a membrane that closely covers the embryo when first formed. It fills with the amniotic fluid which causes the amnion to expand and become amniotic sac.
6. Which hormone prevents the second pregnancy during gestation?
A. FSH
B. LH
C. HCG
D. Progesterone
Answer: D
Clarification: Progesterone level raises during 2nd half of the menstrual cycle. Its role is to thicken the lining of uterus each month. Progesterone prevents the second pregnancy during gestation.
7. When is it first possible to distinguish the sex of the fetus?
A. 1st month
B. 2nd month
C. 3rd month
D. 4th month
View Answer
Answer: C
Clarification: During the 3rd month of pregnancy is it first possible to distinguish the sex of the fetus. XX leads to a baby girl and XY leads to baby boy.
8. Within which extra embryonic membrane are blood cells formed in the early stage of development?
A. Yolk sac
B. Allantois
C. Chorion
D. Allantois
Answer: A
Clarification: Yolk sac provides nourishment. It produces blood cells until the placenta fully forms later in the pregnancy. Towards the end of first trimester the yolk sac shrinks and can no longer be seen on the sonogram.
9. The structure which implants in the endometrium is termed as _________
A. Embryo
B. Zygote
C. Morula
D. Blastocyst
Answer: D
Clarification: The fertilized egg begins to develop into a hollow ball of cells called Blastocyst. The Blastocyst implants in the wall of the uterus.
10. Which membrane plays the greatest role in nutrient and waste exchange?
A. Amnion
B. Chorion
C. Allantois
D. Yolk sac
View Answer
Answer: B
Clarification: Chorion is the outermost membrane surrounding an embryo. Chorion is the double layered membrane formed by the trophoblast. It plays the greatest role in nutrient and waste exchange.
11. The maternal endometrium response to trophoblast invasion is called as a decidual reaction.
A. True
B. False
Answer: A
Clarification: Decidual reaction is the set of changes in the endometrium of the uterus that prepares it for implantation. These changes are observed in each menstrual cycle and enhanced after implantation.
12. Human placenta is classified as ___________
A. Mesoeliochorial
B. Epitheliochoria
C. Haemochorial
D. Endotheliochorial
Answer: C
Clarification: Human placenta is classified as Haemochorial. A placenta in which the maternal blood is in direct contact with the chorion is known as Haemochorial.
13. The physical function of placenta is to function as a shock absorber.
A. True
B. False
Answer: A
Clarification: The physical function of the placenta is to function as a shock absorber. It works like a shock absorber protecting the baby from sudden jolts.
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