Question

Which of the following is true about breathing in humans? a) The diaphragm must contract to create an area of high pressure in lungs for air to enter. b) The diaphragm must contract to create an area of low pressure in lungs for air to enter. c) Air is inhaled when pressure in the lungs is high. d) Air is exhaled when pressure in the lungs is low.

Answer 1

In humans, the diaphragm contracts to create an area of low pressure in the lungs for air to enter during inhalation, and air is exhaled when the diaphragm relaxes and increases the pressure in the lungs.

Step-by-step explanation:

In humans, the diaphragm must contract to create an area of low pressure in the lungs for air to enter.

When the diaphragm contracts and moves downwards, it increases the volume of the thoracic cavity, causing a decrease in pressure within the lungs. This lower pressure allows air to be drawn into the lungs through the airways.

On the other hand, air is exhaled when the diaphragm relaxes and moves upwards, which increases the pressure inside the lungs and forces air out.

Learn more about Breathing in Humans