Follow a human breath

The video explains the process of breathing, focusing on inhalation and exhalation. When we inhale, air enters through the nose and mouth, travels down the trachea, and fills the lungs. Oxygen from the air moves into the bloodstream, while carbon dioxide, a waste product, exits the bloodstream to be exhaled. The lungs then contract, forcing the air out through the nose and mouth, completing the breathing cycle.

What happens to the lungs when you inhale?

• They grow bigger.

• They disappear.

• They stay the same size.

• They become smaller.

Through which structures does air travel to reach the air sacs?

• Capillaries

• Arteries

• Veins

• Bronchioles

What essential gas moves from the air sacs into the bloodstream?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Helium

What is the role of carbon dioxide in the body?

• It helps in digestion.

• It is a waste product.

• It is essential for breathing.

• It provides energy.

What happens to the lungs during exhalation?

• They expand.

• They fill with air.

• They contract.

• They remain unchanged.