What is breathing mechanism?

Answer 1

Mechanisms of breathing -- inspiration

When you breathe in:

• intercostal muscles between the ribs contract, pulling the chest walls up and out
• the diaphragm muscle

  below the lungs contracts and flattens, increasing the size of the chest

• the lungs increase in size, so the pressure inside them falls. This causes air to rush in through the nose or mouth.

Mechanisms of breathing -- expiration

When you breathe out:

• Intercostal muscles between the ribs relax so that the chest walls move in and down.
• The diaphragm muscle below the lungs relaxes and bulges up, reducing the size of the chest.
• The lungs decrease in size, so the pressure inside increases and air is pushed up the trachea and out through the nose or mouth.

Answer 2

When you breath in you usually think that it's just your lungs expanding. Well, there's a whole load of other stuff that goes on when you breath in. When you breath in through your mouth or nose, a curve in your throat called Epiglottis, takes some of the oxygen that you need and puts it into the bloodstream. Meanwhile, your lungs expand and air sacks collect it and helps put it into your bloodstream again. then when you exhale, you're breathing out all the used oxygen.

Answer 3

Mechanism Breathing

This is the process by which the lungs expand to take in air then contract to expel it. The cycle of respiration, which occurs about 15 times per minute, consists of three phases:

Inspiration, Expiration and PauseProper breathing involves all the muscles of the head, neck, thorax and abdomen, in addition to the involuntary musculature of the larynx, trachea and bronchi.

The main muscles of respiration in normal quite breathing are the intercostals muscles and diaphragm.

InspirationExternal intercostals muscles Actively contract

- Ribs and sternum move upwards and outwards

- Width of chest increases from side to side, from front to back and from top to bottom

Diaphragm contracts

- Descends

- Depth of chest increases

Capacity of thorax is increased

Pressure between pleural surfaces is reduced.

Elastic tissue of lungs is stretched.

Lungs Expand to fill thoracic cavity

Air pressure within alveoli is now less than atmospheric pressure

Air is sucked into alveoli from atmosphere

ExpirationExternal intercostals muscles relax

- Rib and sternum move downwards and inwards

- Width of chest diminishes

Diaphragm relaxes

- Ascends

- Depth of chest diminishes

Capacity of thorax is decreased

Pressure between pleural surfaces is increased

Elastic tissue of lungs recoils

Air pressure within alveoli is now greater than atmospheric pressure

Air is forced out of alveoli to atmosphere.

Answer 4

In the human body, air enters and leaves the lungs through the trachea, the bronchi and the bronchioles. During inhalation, the external intercostal muscles contract, resulting in the ribs moving outwards. The diaphragm also flattens by contracting and this causes the volume of the lungs to increase. The pressure in the lungs therefore decreases, enabling air to enter in a passive manner.

During exhalation, the internal intercostal muscles contract while the external intercostal muscles relax. The ribs will hence move inwards. The diaphragm relaxes and the abdominal muscles contract to push the diaphragm back up. This causes the volume of the lungs to decrease and the increase in pressure forces air out of the lungs.

Answer 5

explain the mechanism of breathing?

Answer 6

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