explain breathing mechanisms Related: Respiration in Humans and Plants?

Question

explain breathing mechanisms Related:  Respiration in Humans and Plants?

Answer

Answer

Answer

The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. This action is also known as external respiration. When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity. The diaphragm flattens and moves downwards and the intercostal muscles move the rib cage upwards and out.

Inspiration : This increase in size decreases the internal air pressure and so air from the outside (at a now higher pressure that inside the thorax) rushes into the lungs to equalise the pressures.

Expiration : When we exhale the diaphragm and intercostal muscles relax and return to their resting positions. This reduces the size of the thoracic cavity, thereby increasing the pressure and forcing air out of the lungs.

Answer

*Breathing is a continuous process that involves both inhalation and exhalation. The process of taking in oxygen-rich air is known as inhalation, while the process of releasing carbon dioxide-rich air into the atmosphere is known as exhalation.

*During inhalation, the diaphragm moves down and the ribs move upwards and outwards, thereby increasing the space in the chest cavity. This leads to the movement of air inside the lungs.

*During exhalation, the diaphragm moves to its former position and the ribs move downwards and inwards, thereby reducing the size of the chest cavity. This leads to the movement of air out of the lungs.

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