Question

explain mechanism of respiration?

Answer 1

$\text{\underline{Mechanism\:of\:respiration:}}$

Breathing is a continuous process that involves both:

=> $\sf{\underline{Inhalation}}$

=> $\sf{\underline{Exhalation}}$


$\text{\underline{What\:is\:inhalation..?}}$

The process of taking in oxygen-rich air is known as $\sf{\underline{inhalation.}}$


$\text{\underline{What\:is\:exhalation..?}}$

The process of releasing carbon dioxide-rich air into the atmosphere is known as $\sf{\underline{exhalation.}}$


$\text{\underline{Now,}}$

$\text{\underline{During\:inhalation,}}$

⚫The diaphragm moves down.

⚫The ribs move upwards and outwards.

⚫Thereby increasing the space in the chest cavity.

⚫This leads to the movement of air inside the lungs.


$\text{\underline{And,}}$

$\text{\underline{During\:exhalation,}}$

⚫The diaphragm moves to its former position.

⚫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.

Answer 2

$\underline \bold \orange{respiration}$

Respiration is simply defined as the exchange of oxygen and carbon dioxide into the body. It is the exchange of gases by diffusion between alveoli and blood in blood vessel, across respiratory membrane.

It consist of 4 mechanisms

$\underline \bold \orange{ventilation}$

Ventilation is the exchange of air between the external environment and the alveoli. Air moves by bulk flow .

$\underline \bold \orange{pathway \: of \: air}$

When one breathes air in at sea level, the inhalation is composed of different gases. These gases and their quantities are Oxygen which makes up 21%, Nitrogen which is 78%, Carbon Dioxide with 0.04% and others with significantly smaller portions.

$\underline \bold \orange{inspiration}$

Inspiration is initiated by contraction of the diaphragm and in some cases the intercostals muscles when they receive nervous impulses.

$\underline \bold \orange{expiration}$

During quiet breathing, expiration is normally a passive process and does not require muscles to work (rather it is the result of the muscles relaxing). When the lungs are stretched and expanded, stretch receptors within the alveoli send inhibitory nerve impulses to the medulla oblongata, causing it to stop sending signals to the rib cage and diaphragm to contract.