Respiratory System Functions and Structures

What is the primary function of the respiratory system?

• Transporting nutrients throughout the body

• Pumping blood to all organs

• Transporting air into the lungs and exchanging gases

• Filtering waste products from the blood

Where does air first enter the upper respiratory tract to be filtered, warmed, and moistened?

• Larynx

• Pharynx

• Trachea

• Mouth or nasal cavity

What is the function of the tiny hair cells, called cilia, found in the inner membrane of the trachea?

• To produce sound

• To absorb oxygen into the bloodstream

• To catch dust particles and remove them through coughing

• To regulate body temperature

What structures surround the trachea to protect it and keep it open?

• Alveoli

• Bronchioles

• C-shaped rings of cartilage

• Vocal cords

Where does the exchange of oxygen and carbon dioxide between air and blood primarily occur in the lungs?

• Bronchi

• Bronchioles

• Trachea

• Alveoli