What is the mechanism of respiration in human beings?
Answers
Answer:
Explanation:
When we breathe in or inhale, the ribs expand and the diaphragm flattens which increases the size of the chest cavity and the air is filled into the lungs. The blood brings carbon dioxide from the rest of the body and the oxygen is taken up by blood and carried to all the cells of the body.
Answer:
a) Breathing – Taking in oxygen and expelling carbon – dioxide out is called breathing. It involves following steps –
(i) Inhalation – It is taking in oxygen. It occurs due to contraction of muscles attached to ribs. This lifts ribs and flatter diaphragm, which increase the volume of thoracic cavity. Hence the pressure inside the thoracic cavity decreases and air rushes inside of the lungs.
(ii) Exhalation – It is expelling of carbon – dioxide. It occurs due to relaxation of muscles attached to ribs and diaphragm is done shaped. This decreases the volume of thoracic cavity and decreases air pressure and expels carbon dioxide out of the lung.
b) Exchange of gases – It takes place between the alveoli of lungs and surrounding blood capillaries.
c) Transport of gases in blood – Hemoglobin present in the blood transport. oxygen and carbon dioxide blood. Oxygen is transport from the lungs to the body cells in the form of any hemoglobin.
d) Oxidation of food – Break down of glucose molecules which produce energy. It occurs is into chondria.