NEET BIOLOGY

Detailed explanation-1: -Your left lung is smaller than your right lung, to accommodate for your heart1. 70% of waste is eliminated through your lungs just by breathing2.

Detailed explanation-2: -When you breathe, 70 percent of waste is eliminated in the form of waste gases like carbon dioxide. Small air sacs within the lungs where gas exchange occurs are known as the alveoli. It is estimated that there are 300 to 500 million alveoli in the adult lungs.

Detailed explanation-3: -Its rhythmic contraction and expansion occurs 24 hours a day and it is responsible for 75 % of all of our respiratory effort. When the diaphragm is stimulated by the phrenic nerve it drops downwards from its domed shape, causing an enlargement of the lung capactiy and volume.

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

Detailed explanation-5: -Inhaled air is about 20-percent oxygen. Exhaled air is about 15-percent oxygen. Therefore, about 5-percent of breathed air is consumed in each breath.