Question

According to Boyle's law, the product of pressure and volume is a constant. Hence

• A. If volume of lungs is increased, the pressure decreases proportionately.
• B. If volume of lungs is increased, the pressure also increases proportionately.
• C. If volume of lungs is increased, the pressure decreases disproportionately.
• D. If volume of lungs is increased, the pressure remains the same.

Answer 1

The correct option is A If volume of lungs is increased, the pressure decreases proportionately.

The principle of Boyle's law is applied during inspiration and expiration processes. During inspiration, the lungs expand (volume increases), and the pressure inside the lung falls. The air from outside enters the lungs from high pressure to low pressure. The opposite happens during expiration.