Question

state the role of diaphragm and rib muscles in breathing and alveoli in exchange of gases

Answer 1

Process of breathing =>
The breathing is controlled by the movement of diaphragm. Diaphragm is a membrane which is between the chest and abdomen. The movement of diaphragm is controlled by a group of muscles; called intecostalis muscles.

When the diaphragm moves down, the ribcage expands. This leads to the expansion inside the lungs. As a result, the air moves into the lungs. This process is called inspiration or inhalation.
When the diaphragm moves up, the ribcage contracts. This leads to contraction of the lungs. As a result, the air moves out of the lungs. This process is called expiration or exhalation.

Role of alveoli =>
As we know gas exchange of oxygen and carbon dioxide take place in the alveoli. Oxygen from the inhaled air diffuses through the wall of the alveoli and adjacent capillaries into the red blood cells. The oxygen is then carried by the blood to the body tissue.


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