Question

what is meant my breathing? describe the mechanism of breathing in humans

Answer 1

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◾ Breathing is the process in which air moves in and out of the lungs with the help of various respiratory organs.

➡ Mechanism of Breathing

▶ The breathing process takes place with the help of various respiratory organs, which form the part of our respiratory system.

▶ As we breathe in, we inhale air through our nostrils, which then passes through the nasal cavity, from where the oxygen-rich air reaches our lungs via the windpipe. Our lungs are located in our chest cavity, surrounded by ribs, forming a rib-cage, and a large muscular sheet, called diaphragm, lying in the bottom of the cavity. If you put your hands on your chest and abdomen and lie down for a while, you will feel that your stomach is moving up and down continuously. This happens because breathing involves the movement of the ribcage and the diaphragm. When we inhale, the ribs move up and outwards while the diaphragm moves down.

▶ An exact opposite movement occurs during exhalation when the ribs move down and inwards while the diaphragm moves up. The outward movement of the ribs during inhalation expands our chest cavity increasing the space to accommodate air that rushes to our lungs, whereas the inward movement of the ribs helps the carbon dioxide filled the air to be pushed out of the lungs.
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