Concept 5.3 Lecture Video and Quiz

What is the primary function of the respiratory system?

• To produce hormones

• To pump blood

• To exchange gases

• To digest food

Which system works closely with the respiratory system to facilitate gas exchange?

• Cardiovascular system

• Nervous system

• Endocrine system

• Digestive system

Which of the following is NOT a main structure of the respiratory system?

• Nose

• Heart

• Trachea

• Larynx

What is the role of the conducting zone in the respiratory system?

• To exchange gases

• To warm, humidify, and filter air

• To produce mucus

• To pump blood

Where does air enter the respiratory system?

• Trachea

• Lungs

• Nose

• Mouth

What prevents food from entering the larynx during swallowing?

• Epiglottis

• Diaphragm

• Bronchi

• Trachea

Into how many lobes is the right lung divided?

• Five

• Four

• Three

• Two

What is the function of pleura in the respiratory system?

• To filter air

• To produce mucus

• To pump blood

• To lubricate the lungs

Where does the gas exchange primarily occur in the respiratory system?

• Alveoli

• Trachea

• Bronchi

• Nose

Approximately how many alveoli are present in the human lungs?

• 300 million

• 200 million

• 400 million

• 100 million