1Y: The Respiratory System

Question 1

What is Respiration?

Answer 1

Respiration is the release of energy from food.

It takes place in the cells of the body

Question 2

What is External respiration?

Answer 2

• External respiration is the name given to the way organisms take in oxygen for respiration and get rid of carbon dioxide and water vapour, which are the wastes from respiration.
• In humans this is also called breathing.

Question 3

What are the 8 organs of the respiratory system and their functions?

Answer 3

1. Nose: Take in air. Filter the air with tiny hairs.
2. Trachea: Take air down to lungs.
3. Bronchus: A tube that carries air into a lung
4. Lung: Gaseous exchange.
5. Bronchiole: Small tubules from a bronchus to carry air within a lung.
6. Alveolus: Air sacs for gaseous exchange.
7. Intercostal muscles: Cause the chest to expand and contract.
8. Diaphragm: Cause the volume of the chest to increase and decrease.

Question 4

Explain the Gaseous Exchange in the lungs?

Answer 4

It is estimated that there are around 300 million alveoli in each lung.
They have very thin walls and are surrounded by extremely thin-walled capillaries.

The oxygen in the alveoli moves through their walls and through the walls of the capillaries into the blood.

The carbon dioxide in the blood of the capillaries moves through their walls and through the walls of the alveoli into the inside of the alveoli.

This movement of gas is called diffusion.

Question 5

Label the Respiratory System (attached)

Answer 5

Label the Respiratory System (attached)