Question

Gas exchange in animals always involves

• A. cellular respiration
• B. breathing movements
• C. neural control of exchange
• D. diffusion across membrane

Answer 1

The correct option is D

diffusion across membrane

The correct answer is option (D)

Explanation for the correct option:

1. The gaseous exchange in animals always involves the diffusion of molecules across the membrane.
2. Through diffusion, oxygen is exchanged between the air present in the lungs and the blood in the capillaries.
3. Similarly, the carbon dioxide present in the blood capillaries of the lungs diffuses into the air and is released during expiration.

Explanation of the incorrect options:

Option (A):

1. Cellular respiration is defined as the process by which glucose is broken down in the cells for the release of carbon dioxide and energy.
2. Cellular respiration does not occur during the gaseous exchange and is a separate process.

Option (B):

1. Breathing movements play an important role in the inhalation of air in the lungs as well as in the exhalation of the air out from the lungs.

Option (C):

1. The gaseous exchange is controlled by the nervous system which helps in the maintenance of homeostasis conditions in the body.

Final answer: Gas exchange in animals always involves diffusion across the membrane.