Gas exchange in humans

What is the process of expelling out air from the lungs called?

• inhalation

• exhalation

• respiration

• suffocation

Where does gas exchange specifically happen in the respiratory system?

• trachea

• lungs

• bronchioles

• alveoli

A characteristic of a respiratory surface is to have a large surface area. How is this achieved in the human body?

• The human lungs are large and spacious.

• There are numerous tiny alveoli within the lungs.

• Each alveoli is enveloped or covered by blood vessels.

• The diaphragm lowers and causes the lungs to expand when we breathe in.

A characteristic of a respiratory surface is to have a good blood supply. How is this achieved in the human body?

• The human lungs are large and spacious.

• There are numerous tiny alveoli within the lungs.

• Each alveoli is enveloped or covered by blood vessels.

• The diaphragm lowers and causes the lungs to expand when we breathe in.

What does NOT happen during the gas exchange in the lungs?

• Oxygen from the blood diffuses into the alveollus.

• Oxygen from the air in the alveolus diffuses into the blood.

• Carbon dioxide diffuses from the blood into the alveolus.

• The gas exchange happens across the walls of the capillary and alveolus.

Which is the CORRECT flow of air when a person breathes in?

• nostril > larynx > trachea > bronchi > bronchioles > alveolus

• alveolus > bronchi > bronchioles > trachea > larynx

• mouth > larynx > trachea > bronchioles > bronchi > alveolus

• nostril > larynx > trachea > bronchi > lungs

Which is the CORRECT flow of air when a person breathes out?

• nostril > larynx > trachea > bronchioles > bronchi > alveolus

• alveolus > bronchioles > bronchi > trachea > larynx > mouth

• bronchioles > bronchi > alveolus > trachea > larynx > mouth

• alveolus > trachea > bronchioles > bronchi > larynx > nostril

Which is NOT part of the respiratory system?

• esophagus

• trachea

• bronchus

• alveolus

Which is part of the respiratory system?

• Brain

• Blood

• Lungs

• Oxygen

What would be the concentration of gases in the air we breathe out?

• High in oxygen, low in carbon dioxide

• High in oxygen, high in carbon dioxide

• Low in oxygen, high in carbon dioxide

• Low in oxygen, low in carbon dioxide