Tag: fertilization and post fertilization in humans

Questions Related to fertilization and post fertilization in humans

Structure connecting the fetus to placenta is ________________.

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Umbilical cord

  2. Amnion

  3. Yolk sac

  4. Chorion

Show answer
Correct Option: A
Explanation:

Umbilical cord is a narrow, tube-like structure that connects the fetus to the placenta.Through this tube, nutrients and oxygen are supplied from the mother to the baby and waste products are removed from the baby.

Which of the following hormones is not a secretory product of human placenta?

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Human Chorionic Gonadotropin

  2. Prolactin

  3. Estrogen

  4. Progesterone

Show answer
Correct Option: B
Explanation:

Prolactin is secreted by the anterior lobe of pituitary gland. After parturition, secretion and storage of milk in mammary glands is under the influence of this hormone.

Fetus gets nourishment and oxygen through _______________.

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Allantois

  2. Placenta

  3. Yolk sac

  4. Chorion

Show answer
Correct Option: B
Explanation:

Placenta is an intimate connection between the fetus and uterine wall of the mother to exchange the materials. Food materials and oxygen pass from the mother's blood into the fetal blood and fetal excretory products diffuse into maternal blood through placenta.

In humans the shape of fully formed placenta is

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Cuboidal

  2. Columnar

  3. Pyramidal

  4. Discoidal

Show answer
Correct Option: D
Explanation:

The human placenta is both metadiscoidal and monodiscoidal. Discoidal refers to the structure of the placenta and mono meaning there is only one disc. Metadiscoidal refers to the way the developing placenta becomes discoidal- the villi are scattered at first and then restricted to one disc, that means the placenta becomes mono-discoidal.

So, the correct answer is 'Discoidal'.

Mother's blood flows into the foetus through placenta

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
The placenta is a temporary association between the foetal and maternal tissues. It acts as a barrier between the foetus and mother and is contributed by both foetal and maternal tissue. Exchange of gases takes place through the placenta. The foetus obtains nutrients and oxygen from the mother's blood as the mother's blood can flow into the foetus through the placenta.
Hence, the statement given in the question is correct.
So, the correct answer is 'True'.

The Pulmonary trunk and systemic aorta of Foetus, connected by?

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Ligamentum arteriosum

  2. Ductus arteriosus

  3. Ductus arteriosum

  4. Chordae terdinae

Show answer
Correct Option: B
Explanation:

The ductus arteriosus acts as a shunt between the pulmonary artery and the aorta during fetal development. In the fetus, before returning to the body, the blood is oxygenated in the placenta. Amniotic fluid fills the lungs and can not therefore be used to oxygenate the blood. Rather, the arterioles in the lungs restrict the quantity of blood flow that can pass through.

Human placenta is

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Haemochorial

  2. Syndesmochorial

  3. Yolk sac

  4. Haemo-endothelial

Show answer
Correct Option: A
Explanation:
Placenta, an organ characteristic of true mammals during pregnancy, joining mother and offspring, providing endocrine secretion and selective exchange of soluble blood borne substances through apposition of uterine and trophoblastic vascularized parts. In humans, haemochorial placenta is found in which all maternal layers are lost, so that foetal tissue is in contact with maternal blood. It is also seen in rodents, and most primates
So, the correct answer is 'Haemochorial'

Mammalian placenta originates from

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Allantois and chorion

  2. Yolksac

  3. Allantois

  4. Amnion

Show answer
Correct Option: A
Explanation:

The placenta is formed from the chorion and allantois of the embryo and from the mother's endometrium. Its main function is to allow the exchange of substances between the fetus and the mother's body. 

Placenta in human beings is formed by

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Amnion

  2. Chorion

  3. Allantois

  4. Allantois, chorion and uterine wall

Show answer
Correct Option: D
Explanation:

The placenta is an organ, that connects the developing foetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply, fight against internal infection and produce hormones to support pregnancy. In humans, the placenta usually has a disc shape and it is formed by allantois, chorion and uterine wall.

The _____ is connecting structure which helps in the transfer of substance to and from the foetal body.

zoology reproduction in humans placenta pregnancy and birth fertilization and post fertilization in humans

  1. Placenta

  2. Ovary

  3. Uterus

  4. vagina

Show answer
Correct Option: A
Explanation:

The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination and gas exchange.
Ovary produces egg or ovum. Uterus is where implantation takes places and embryo develops. Vagina is the fibromuscular organ that facilitates sexual intercourse and childbirth.
Therefore, the correct answer is option A.