MICROANATOMY

Detailed explanation-1: -When we exhale, the composition of the air remains almost the same as the air we inhale, only the percentage of carbon dioxide and oxygen changes. The amount of inhaled air contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide.

Detailed explanation-2: -Carbon dioxide diffuses into the lungs and is expelled as we exhale. While the deoxygenated blood travels in the veins, detectors in the brain and blood vessels (chemoreceptors) measure the blood’s pH.

Detailed explanation-3: -The role of the respiratory system is to breathe in oxygen and breathe out carbon dioxide. This is known as respiration. The cells of the body use oxygen to perform functions that keep us alive.

Detailed explanation-4: -In turn, exhaled air contains: nitrogen – 78% oxygen – 17% carbon dioxide – 4% other gases – 1%.

Detailed explanation-5: -We breathe out air which is rich in carbon dioxide. The air we breathe in is transported to all parts of the body and ultimately to each cell. In the cells, oxygen in the air helps in the breakdown of food. The process of breakdown of food in the cell with the release of energy is called cellular respiration.