Question

Ram walked for 10 minutes and Shyam ran for 100m. Karan is at rest. Arrange in decreasing order of breathing rate.
(a) Ram>Shyam>Karan
(b) Karan>Shyam>Ram
(c) Shyam>Ram>Karan
(d) All the three will have the same breathing rate

Answer 1

Hint: Breathing rate depends upon the number of inspiration and expiration in one minute. One breathing consists of one inspiration and one expiration. The breathing rate depends on body function.

Complete answer:
Breathing rate increases with an increase in the rate of inspiration and expiration.
In the case of Ram, he walked for 10 minutes which means that his breathing rate slightly increases in comparison to the rest of the person.
In the case of Shyam, he ran 100m which shows a high increase in breathing rate because running elevates the breathing process to fulfill the high oxygen demand of the body.
In the case of Karan, he is at rest that's why his breathing rate will not change.
This shows that Shyam’s breathing rate is higher than the ram and ram's breathing rate is higher than Karan.

Additional Information: A healthy human can breathe 12-16 times per minute and an infant shows a breathing rate of 42-44 times per minute. In breathing, process inspiration takes 2 seconds and the expiration process takes 3 seconds.
The mechanism of respiration is controlled by medulla oblongata and pons varolii. The medulla oblongata is also called the respiratory center. The respiratory center is divided into three groups Dorsal respiratory group, Ventral respiratory group, and pneumatic center. Breathing is also controlled by a large number of chemoreceptors present in carotid bodies and aortic bodies, chemoreceptors are stimulated by an increase in carbon dioxide concentration with an increase in hydrogen ion concentration.
Mammals show negative pressure breathing which means lungs withdraw air due to a reduction in pressure. Negative pressure breathing gently moves air into the windpipe and prevents it from moving into the food pipe.
So, the correct answer is Shyam>Ram>Karan

Note: Not only does exercise increase the breathing rate, but breathing rate also gets increased by some disease. The breathing rate gets affected in the case of asthma, pneumonia, bronchitis, and emphysema.