The video tutorial explains the process of breathing, highlighting its two main phases: inhalation and exhalation. It describes how the diaphragm and intercostal muscles facilitate breathing by creating a pressure difference that allows air to flow into the lungs. The tutorial emphasizes the importance of these muscles and the mechanics of air pressure in the breathing process.

What physical sensations are commonly noticed when breathing heavily?

• The chest remains still.

• The chest rises and falls quickly.

• The stomach contracts inward.

• The arms move up and down.

What are the two main phases of breathing?

• Inhalation and exhalation

• Exhalation and ventilation

• Inspiration and expiration

• Inhalation and respiration

During inhalation, what happens to the chest and stomach?

• They move inward.

• They remain still.

• They move outward.

• They contract.

Which muscles are primarily responsible for the work of breathing?

• Quadriceps and hamstrings

• Abdominal muscles

• Diaphragm and intercostal muscles

• Biceps and triceps

How does air enter the lungs during breathing?

• By being sucked in actively

• Due to a pressure difference

• Through muscle contraction

• By expanding the lungs manually