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The Mechanism of Breathing

Breathing

The physical moment  associated with the gaseous exchange are called breathing.There are two phases of breathing i.e. inhalation and exhalation.

The breathing is the process in which air enter and out of lungs.

Breathing is necessary to sustain life.Breathing is the process in which oxygen enter the body and carbon-dioxide removed.

The Mechanism of Breathing

1.Inspiration or inhalation:

During inspiration,the rib muscles contract and ribs are raised.At the same time the dome-shaped diaphragm contracts and is lowered.These movements increase the area of the thoracic cavity,which reduces the pressure on lungs.As a result the lungs expand and the air pressure within them also decreases.The air from outside rushes into the lungs to equalize the pressure on both sides.

The Mechanism of Breathing

Expiration or Exhalation:

The Mechanism of Breathing

After the gaseous exchange in the lungs,the impure air is expelled out in exhalation.The rib muscles relax bringing the ribs back to the original  position.The diaphragm muscles also relax and it gets its raised dome shape.This reduces the space in the chest cavity and increases the pressure on lungs.The lungs contract and the air is expelled out of them.

Human breathe 16-20 times  per minute in normal circumstances i.e.at rest.The rate of breathing is controlled  by the respiratory centre in the brain.The respiratory centre is sensitive to the concentration of carbon dioxide in the blood.

When we do exercise or some hard job our muscle cells carry out cellular respiration at greater rate.It results in the production of more carbon dioxide which is released in the blood.This greater than normal concentration of carbon dioxide stimulate the respiratory centre  of brain.The respiratory centre sends messages to the rib muscles and diaphragm to increase the rate of breathing so that the excess carbon dioxide present in blood can be removed out of body.During exercises or other hard physical works the breathing may increase up to 30-40 times per minute.

Deep breathing exercise:

In this exercise by deep belly belly breathing increases oxygenation and lungs capacity through the body,its strengthens your immune system and help in relieve stress.Try counting to 10 as you breathe  in deep,and then hold for a count 10 and exhale  5-10 cycles  to realize that deep breathing  benefits you.

(The Mechanism of Breathing)