IGCSE Gas Exchange in Humans

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 shows the correct sequence of air passage into the lungs?

• trachea → larynx → air sacs → bronchi

• larynx → trachea → bronchi → air sacs

• air sacs → larynx → trachea → bronchi

• larynx → bronchi → trachea → air sacs

The exhaled air from our body consists mostly of

• carbon dioxide.

• nitrogen.

• oxygen.

• water vapour.

Inhalation occurs from

• P to Q

• P to R

• R to S

• R to T

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.

What is the rate of breathing of this person at rest?

• 10 breaths per minute

• 12 breaths per minute

• 18 breaths per minute

• 24 breaths per minute

Which of the following structures is supported by cartilage?

• aorta

• oesophagus

• bronchus

• vena cava

Which of the following correctly describes the functioning of the human breathing system?

• The bronchus cannot change its size.

• The nasal cavity has hairs to trap dust.

• The diaphragm muscle contracts during inhalation.

• The lung expels air through its muscular contraction.

The film of water on the surface of human air sacs serves to

• warm the incoming air.

• moisten the incoming air.

• trap dust in the inhaled air.

• dissolve the gases in the inhaled air.