Question

Define breathing . Describe the mechanism of breathing in humans. With diagrams​

Answer 1

Answer:

The process of taking air into and expelling it from the lungs is called breathing. The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. ... When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity.

Explanation:

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Answer 2

Answer:

Breathing:-

It is a process of taking in oxygen and passing out Co2 .It is a simple process and it is a physical process

Mechanism of breathing:-

lungs are connected to our nostrils through wind pipe .the process of breathing takes place in our lungs.when we inhale air ,air enters into nostrils ,passes through nasal passage and reaches our lungs.Our lungs hanged in chest cavity ,and are surrounded by ribs for protection .Breathing involves the movement of rib cage and diphragm. when we inhale air chest cavity becomes bigger and when we exhale chest cavity becomes smaller.

Diagram:-

As shown in figure

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