Question

an follicle cells. Corpus luteum, in turn, secretes progesteron
der the effect of LH. The progesterone increases the thicknes
endometrial lining of uterus so that implantation of foetus coul
ke place.
Or
plain the process of inspiration under normal conditions
e movement of air into and out of the lungs is carried out by
eating a pressure gradient between the lungs and the atmosphere
e diaphragm and the intercostal muscles help in the generation
such a pressure gradient.
eathing involves two steps:
Inspiration, during which air is drawn into the lungs and
Expiration, during which alveolar air is sent out.
spiration​

Answer 1

Answer:

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