8Cb Gas exchange - Katie Bruce | Biblioteka

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Explain why air moves out of the lungs. Make reference to the ribcage and muscles involved.

1

Why do humans need a gas exchange system?

To provide oxygen for respiration and remove carbon dioxide

To pump blood around the body

To break down food into smaller molecules

To cool the body down

1

Where does respiration take place in the human body?

Only in the lungs

Only in the heart

In every single cell

Only in the muscles

1

Which two gases are exchanged in the lungs?

Oxygen and nitrogen

Carbon dioxide and oxygen

Oxygen and hydrogen

Carbon dioxide and methane

1

What is the main function of the alveoli in the lungs?

To digest food

To store oxygen

To allow gas exchange between the air and the blood

To pump blood around the body

1

How does oxygen get from the alveoli into the blood?

It is pumped by the heart

It dissolves in water and moves through the skin

It diffuses through the thin walls of the alveoli into the blood

It is pushed into the blood by the diaphragm

1

What happens to the carbon dioxide in the blood when it reaches the lungs?

It is used by the alveoli to make energy

It diffuses out of the blood and into the air in the alveoli

It is converted into oxygen

It stays in the blood to help with respiration

1

Why do humans breathe more heavily when they exercise?

The lungs need to store more oxygen

The body needs more oxygen for respiration, and more carbon dioxide must be removed

The body needs to get rid of extra water

The lungs expand to make space for more air

1

Which part of the blood carries oxygen from the lungs to the rest of the body?

White blood cells

Platelets

Red blood cells

Plasma

1

What happens to the oxygen once it reaches the body’s cells?

It is used for respiration to release energy

It is stored in the cells for later use

It turns into carbon dioxide immediately

It is turned into food

1

Why is the gas exchange system important for survival?

It provides the oxygen needed for respiration to release energy

It helps in digesting food

It removes nitrogen from the body

It controls body temperature

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