Importance of Placenta

Q.

Give a reason, “blood of mother never mixes up with that of fetus, yet it nourishes the fetus”.

Q.

How are chorionic villi formed?

Q.

How does the placenta form during pregnancy?

Q. The fertilised egg in human beings gets implanted in uterus ________.

1. after one month of fertilisation
2. after two months of fertilisation
3. after about 7 days of fertilisation
4. after 3 weeks of fertilisation

Q.

Origin of heart:

1. ectoderm

2. mesoderm

3. endoderm

4. all

Q.

What is placenta? Explain how it is formed.

Q.

Why is human chorionic gonadotropin important?

Q. What is Placenta? Write two functions of Placenta.

Q. The smallest animal egg is that of

1. Ostrich
2. Duck
3. Human female
4. Hen

Q. The type of placenta present in man is

1. epitheliochorial placenta
2. haemochorial placenta
3. exotheliochorial placenta
4. syndesmochorial placenta

Q. Which of the following hormones, if present in higher concentration at the end of gestation, will likely delay the process of parturition in the human female?

1. Prostaglandin
   
2. Oxytocin
   
3. Estrogen
   
4. Progesterone

Q. Name:​

The tissue that helps to attach ovules on the ovary.​

Q.

Name the structure formed by the villi of the embryo and the uterus of the mother

Q.

How does the embryo gets nourishment from the mothers womb?

Q.

Which is the structure that connects the fetus to the placenta?

1. Amnion

2. Umbilical cord

3. Chorion

4. Yolk sac

Q. Umbilical cord contains

Q. Fill in the blanks using suitable words.

(v) A tissue that attaches ovules on the ovary wall is ________

Q. Explain the structure of placenta. Also write two functions of placenta.

Q. What is placenta? State its function in human female.

Q.

How is the embryo connected to the placenta?

Q. Name the hormones secreted by human placenta.

Q. Write ‘True’ or ‘False’ for the statement given below:

Human placenta is chorionic and discoidal.

1. True
2. False

Q. The placenta functions as

1. A protective barrier between mother and embryo
2. Supply oxygen and nutrients for growth of embryo
3. Expel the waste matter excreted by the embryo
4. All of the above

Q.

Why is umbilical cord called the lifeline of the developing baby?

Q. The antigen binding site of an antibody is present at -

1. Between constant and variable region
2. The constant region
3. The C-terminal
4. The variable region

Q. Fill in the blank:
The structure which provides vascular connection between foetus and uterus is called __________

Q. Why cannot a woman get pregnant again during pregnancy?

1. A woman ovulates during pregnancy, but the oviducts are plugged with protective mucus to prevent sperm from entering.
2. A woman cannot have intercourse during pregnancy.
3. High levels of estrogen and progesterone, secreted by the corpus luteum or placenta during pregnancy, inhibit the secretion of gonadotropins and prevent ovulation.
4. High levels of hCG in women's bodies kill sperm.

Q. List any four hormones secreted by placenta.

Q. During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?

Q. is a specialised organ for exchange of nutrients between the maternal and the foetal blood.

1. Morula
2. Placenta
3. Zona pellucida
4. Vulva