Gas Exchange in mammals

Cystic fibrosis is an inherited condition.

Explain why people with cystic fibrosis can have breathing difficulties.

Many animals have specialised organs for gas exchange and transport.

*(a) The diagram below shows the lungs of a mammal.

Describe and explain how the lungs of a mammal are adapted for rapid gas exchange.

(ii) In mammals, blood passes through the heart twice for each circulation of the body.

Suggest how this type of circulation enables mammals to carry out effective gas exchange.

Where does gas exchange take place in the lungs?

• Alvioli
• Trachea
• Tracheoles
• Alveoli

What is the correct order for air entering the lungs?

• Trachea - Bronchi - Bronchioles- Alveoli
• Trachea - Tracheoles - Bronchi
• Alveoli - Bronchi- Bronchioles - Spiracles
• Trachea - Bronchioles - Bronchi - Alveoli

How is the trachea kept open?

• Air flowing into it
• Chitin rings
• Cartilage rings
• Boney arches

What happens when you breathe in? (tick all that apply)

• diaphragm relaxes and moves up

• diaphragm contracts and flattens

• increases volume in thorax

• reduces volume in thorax

The diagram below which shows the inner lining of a certain part of the human body. This inner lining can be found in

• the trachea.

• the air sacs.

• the capillaries.

• the small intestine.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

Which of the following features of the respiratory tract helps to warm the inhaled air?

• The nasal cavity has a lot of hair.

• The lining of the trachea is covered with cilia.

• The lining of the respiratory tract is coated with mucus.

• The wall of the nasal cavity is richly supplied with capillaries.

The lining of the nasal cavity is covered with a thin film of mucus. What is the importance of the mucus?

• It warms up the inhaled air.

• It helps remove dust from the incoming air.

• It lubricates the passage of air into the respiratory trac.

• It helps dissolve oxygen in the inhaled air for gas exchange.