What is the primary function of the respiratory system?

• To circulate blood throughout the body

• To break down food into nutrients

• To exchange gases between the body and the environment

• To protect the body from infections

Which organ is primarily responsible for gas exchange in the respiratory system?

• Heart

• Lungs

• Stomach

• Liver

Which of the following structures is responsible for the exchange of gases in the lungs?

• Alveoli

• Pharynx

• Nasal cavity

• Diaphragm

What is the function of the diaphragm in the respiratory system?

• It filters air entering the nasal cavity.

• It contracts and relaxes to help with breathing.

• It exchanges oxygen and carbon dioxide in the blood.

• It connects the nasal cavity to the lungs.

What is the primary function of breathing?

• To release energy in cells

• To inhale oxygen and exhale carbon dioxide

• To produce glucose

• To transport nutrients

Where does cellular respiration primarily occur?

• In the lungs

• In the mitochondria

• In the trachea

• In the nasal cavity

What type of process is cellular respiration?

• Physical process

• Chemical process

• Mechanical process

• Biological process

How does the nasal cavity contribute to the sense of smell?

• By producing sound

• By using olfactory nerves

• By digesting food

• By circulating blood

What is the primary function of the pharynx?

• It is a passage for air to travel to the trachea.

• It is a muscle that pumps blood.

• It is a storage area for food.

• It is a part of the brain.

What structure prevents food and liquid from entering the trachea?

• Epiglottis

• Nasal cavity

• Soft palate

• Tongue