The Human Respiratory System

What is the primary function of the human respiratory system?

• To supply the blood with oxygen and remove carbon dioxide

• To digest food and absorb nutrients

• To circulate blood throughout the body

• To protect the body from infections

Where does the gas exchange occur in the respiratory system?

• In the alveoli

• In the trachea

• In the bronchi

• In the larynx

What role does the diaphragm play in the respiratory system?

• It contracts and relaxes to enable breathing

• It filters the air entering the lungs

• It warms and humidifies the air

• It transports oxygen to the blood

How does oxygen enter the blood from the alveoli?

• Through diffusion

• Through active transport

• Through osmosis

• Through filtration

What happens when the diaphragm relaxes?

• Air is pushed out of the lungs

• Air is pulled into the lungs

• The trachea expands

• The bronchi contract