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प्रश्न
Give Reasons
The full-grown human embryo respires but does not breathe.
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उत्तर
The full-grown human embryo respires because the dissolved oxygen in the mother’s blood diffuses into the embryo and is used in the oxidation of glucose in the cells with the liberation of energy. However there are no breathing movements as the lungs lie collapsed in the embryo and the only function after the fetus is expelled from the mother’s body. Therefore no breathing movements in the embryo as it receives oxygen by diffusion of gases.
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संबंधित प्रश्न
Given below are the names of certain stages/substances related to reproduction and found in human body. Answer the questions related to them.
Gestation
• What is its meaning?
• How long does it normally last?
The diagram given alongside is that of a developing human foetus in the womb. Study the same and answer the questions that follows:
Name the parts ‘1’ to ‘5’ indicated by guidelines
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The protective sac which develops around the developing embryo is called the Pericardium.
Describe briefly the ways how a mammalian embryo is respires
Study the diagram given below and then answer the questions that follow:
(i) Name the parts labeled 1 and 2. State the function of each part.
(ii) State any one function of the amniotic fluid.
(iii) What is the role of the umbilical cord in the development of the fetus?
(iv) Name the part in the diagram which is endocrine in nature.
Name the Following
The expulsion of the fetus from the body of the mother.
Mention any two functions of the human foetal placenta.
Placenta produces certain hormones.
Amniotic fluid serves to provide oxygen to the foetus.
Mother's blood flows into the foetus through placenta.
