Question

Explain exchange of gases in humans.

Answer 1

here is your answer.....

The process of exchange of gases in humans is known as respiration.This process is carried out by breathing.Humans inhale oxygen and exhale carbon dioxide.

hope it helps..

Answer 2

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Exchange of Gases :

• The exchange of gases [Oxygen and Carbon dioxide ] takes place in alveoli .
• When we inhale oxygen - rich air ,the amount of oxygen present in alveloi is more than the blood present in the surrounding capillaries so oxygen diffuses from air in alveoli to the blood in capilllaries .
• Similarly the blood present in surrounding capillaries has more carbon dioxide than the air present in the alveoli so carbon dioxide moves from capillaries blood to the air present in the alveoli.
• In alveoli increase amount of Oxygen or Carbon dioxide then High concentration to low concentration called Diffusion .
• The exchange of gases have two process - 1] lungs - alveoli 2] Blood - Tissue .
• Gaseous exchange in our body takes place in alveoli of lungs
• There are million of alveoli in the lungs and these alveoli provide a very large area for the exchnage of gases .

1] External Respiration :

⇒ The exchange of gases between alveoli and pulmonary capillaries is called External respiration , Alveoli are the primary sites of gas exchange .Oxygen and carbon dioxide are exchanged in these sites by simple diffusion based on -

• Pressure
• Solubility of gases
• Thickness of membranes
• Surface area of respiratory membrane .

2] Internal Respiration :

⇒The exchange of gases between tissue blood capillaries and tissue cells called Internal Respiration , It takes places by simple diffusion process .