Question

Breathing involves how many stages? ​

Answer 1

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BREATHING INVOLVES 4 STEPS...

• inhaling of oxygen
• purification of blood
• breaking down of energy molecules
• exhaling of carbon dioxide

Answer 2

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Stages in breathing ::

✴Breathing involves two stages

✴Inspiration

✴Expiration..

INSPIRATION ::

✴inspiration in mammals is active process..

✴It involves in the contraction of external intercoastal muscles and diaphragm..

✴It leads to increase in volume of thoracic cavity in antero -posterior axis.

✴Decrease in pressure in the pulmonary cavity which is less than the atmospheric pressure.

✴As a result air enters into the lungs.

EXPIRATION ::

✴Expiration is a passive process..

✴it involves relaxation of external intercoastal muscles and diaphragm.

✴It leads to decrease in volume of thoracic cavity in antero -posterior axis.

✴Increase in the pressure in the lungs leads to the expulsion of the air out..

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