Question

During respiration exchange of gases take place in

• A. trachea and larynx
• B. alveoli of lungs
• C. alveoli and throat
• D. throat and larynx

Answer 1

The correct option is B

alveoli of lungs

The correct option is : B.

The explanation for the correct option:

1. Respiration is a biological process that involves burning of food in the presence of oxygen and form glucose to produce energy.
2. It results in the emission of carbon dioxide, water, and ATP (energy).
3. Breathing is only one aspect of respiration.
4. Each lung contains millions of alveoli, which are the actual sites of gaseous exchange.
5. A vast network of blood capillaries and blood vessels is present here.
6. The alveoli are filled with air as it enters our lungs through the nose tube.
7. The oxygen is taken in through simple diffusion by the blood vessels in the alveoli.
8. The pressure gradient between oxygen and carbon dioxide allows the diffusion.
9. This pressure difference brings the gas exchange between the alveoli and blood capillaries around it.
10. Thus gas exchange occurs in the alveoli of the lungs.

The explanation for the incorrect options:

Option A

1. The trachea and larynx are the air-conducting parts of the respiratory system.
2. They carry in and out oxygen and carbon dioxide in the body.
3. The larynx is the voice box and produces sound.
4. The trachea is also called the windpipe.

Option C

1. The alveoli are meant for gas exchange in the body.
2. They are arranged in clusters in the lungs, and it is a gas exchange part of the respiratory system.
3. The throat is meant for air passage in the respiratory system.
4. It is located behind the mouth.

Option D

1. The larynx is the voice box in man.
2. It is a sound-producing organ and has two vocal cords.
3. The throat is also an air-conducting passage.
4. It separates the food and air with the help of epiglottitis.

Final answer: During respiration exchange of gases take place in the alveoli of the lungs.