Describe the mechanism of breathing in man.
Answers
The mechanism of breathing is closely related to cellular respiration, where oxidation-reduction reactions are used to break down glucose as well as other substances.
The mechanism can be explained in the following ways:-
1. The air is taken up by the nostrils. The nose contains mucus and hairs which filter the air passing through the nose.
2. The air then enters the bronchi which divide into bronchioles and further into alveoli.
3. The alveoli are very small parts of the lung which increase the surface area that is in contact with the oxygen rich air.
4. Here, the exchange of gases, namely oxygen and carbon dioxide, takes place.
5. The alveoli is supplied with many blood capillaries so that the oxygen can be transported to the different parts of the body.
6. Oxygen is not passed on by diffusion alone. For this purpose, humans have a respiratory pigment called haemoglobin which has a high affinity for oxygen and thus transports the oxygen to the different parts of the body.
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When we inhale air,it passes through our nostrils into the nasal cavity. from the nasal cavity,the air reaches our lungs through the wind pipe.lungs are present in the chest cavity.this cavity is sorrounded by ribs.a large muscular sheet called diaphram forms the floor of the chest cavity.breathing involves the movement of the diaphram and the rib cage.during inhalation,ribs moves up and outwards and diaphram moves down.this movement increases space in our chest cavity and air rushes into the lungs.the lungs get filled with air.during exhalation,ribs move down and inwards while diaphram moves up to its former position.this redues the size of the chest cavity and air is pushed out of the lungs