Question

.Draw a neat and well labelled diagram showing gaseous exchange in an alveolus

Answer 1

Gaseous exchange in an alveolus:

• Alveoli are the main organelles responsible for the exchange of oxygen and carbon dioxide from the blood.
• It is estimated that there are around 300 - 500 alveoli in an adult's lungs.
• The capillaries run close to the walls of alveoli which facilitated the process of exchange of gases.
• The alveoli are made up of a very thin layer of simple squamous epithelium.
• The deoxygenated blood from the heart reaching the lungs contains CO₂ and the alveoli containing O₂, exchange of gases takes place in the alveoli itself.
• The CO₂ from the lungs is then exhaled through the respiration process.
• The gaseous exchange allows the body to replenish oxygen and eliminates carbon dioxide.

Answer 2

Answer:

Gaseous exchange in alveolus

Explanation:

• The movement of air occurs through the mouth or nose, which quickly moves to the pharynx or throat.
• From there, it moves through the larynx and enters the trachea.
• There are small bronchioles within the trachea that end in tiny air sacs.
• These structures are known as alveoli. It is inflated when a person inhales and deflated when a person exhales.
• During the process of exchange of gases, oxygen moves from the lungs to the bloodstream.
• At the same time, carbon dioxide moves from the blood to the lungs.
• We can see capillaries, which are a network of tiny blood vessels through which red blood cells travel.
• The walls of the alveoli share a membrane with the capillaries.
• This helps oxygen and carbon dioxide diffuse between the respiratory system and the bloodstream.
• Oxygen molecules get attached to the RBC, which moves back to the heart.
• At the same time, carbon dioxide molecules in the alveoli are exhaled out of the body.
• Thus, this exchange of gases helps oxygen to replenish and carbon dioxide to be eliminated.

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