Name: How Plants and Animals Derive Energy
Uploaded: 2019-07-19
Duration: 9 min 56 s
Description: We need the energy to do physical work and also to keep our body in optimal condition. We get energy from food, derived either from plants or animals. Plants...

Question

The volume of air in the lungs and the rate at which it is exchanged during inspiration and expiration was measured.

The following diagram shows a group of lung volume and capacities:

Study the diagram carefully and explain briefly the following:

(a) Tidal volume

(b) Inspiratory reserve volume

(c) Expiratory reserve volume

(d) Vital capacity

(e) Residual volume

Accepted Answer

Lungs are the primary respiratory organs. They have specific capacities to hold the air inhaled. The respiratory volumes or the lung capacities in an adult human are as follows:

(a) Tidal volume – It is the air breathed in and out during normal breathing. It is equal to 500mL.

(b) Inspiratory reserve volume – It is the amount of air that can be drawn in forcibly over and above the tidal air. It is referred to as IRV or complemental air and is equal to 3000mL.

(c) Expiratory reserve volume – It is the amount of air that can be expelled out forcibly after a normal expiration. It is referred to as ERV or supplemental air and is equal to 1000mL.

(d) Vital capacity (VC) – It is the volume of air that can be inhaled and exhaled by maximum inspiration and expiration respectively and is about 4500mL.

(e) Residual volume (RV) – Even after forcible expiration, there is some air left in the lungs and is referred to as residual volume. It is about 1500mL.

Important Questions on The Respiratory System

Learn and Prepare for any exam you want !