Biology
Does the foetus inside the mother's uterus breathe? Yes/No
Reproductive System
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Answer
No
Reason — No, the foetus inside the mother's uterus does not breathe in the same way as a born baby or an adult. The exchange of gases between the mother's blood and the foetal blood takes place in the placenta, and the foetus obtains the necessary oxygen and eliminates carbon dioxide through this process. The actual breathing, as in inhaling and exhaling air into the lungs, only begins after birth when the baby takes its first breath.
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Write one sentence each using the following terms pertaining to reproduction in humans.
(i) Gestation
(ii) 280 days
(iii) Head first
(iv) Placenta
(v) After-birth
(vi) Tied and cut
Mention if the following statements are True (T) or False (F):
(i) Placenta produces certain hormones.
(ii) Amniotic fluid serves to provide oxygen to the foetus.
(iii) Heart and blood vessels have been formed by the end of five weeks of pregnancy.
(iv) Mother's blood flows into the foetus through placenta.
Complete the following by filling in the blanks 1 to 5 with appropriate words:
The human female gonads are ovaries. A maturing egg in the ovary is present in a sac of cells called ……………(1). As the egg grows larger, the follicle enlarges and gets filled with a fluid and is now called the …………… (2) follicle. The process of releasing the egg from the ovary is called …………… (3). The ovum is picked up by the oviductal funnel and fertilization takes place in the ……………(4). In about a week the blastocyst gets fixed in the endometrium of the uterus and this process is called ……………(5).