Which of the following is the main function of the respiratory system?

• exchanging gasses

• producing sound

• enabling sense of smell

• maintaining pH levels

Which of the following are the functions of mucus in the respiratory system? Select all that apply.

• exchanging gasses with the blood

• moving foreign particles out of the airways

• keeping the airways moist

• trapping microorganisms

Which of the following parts of the respiratory system contains the structure required to produce sound?

• trachea

• larynx

• oral cavity

• pharynx

Drag to correctly order the steps in expiration.

• air flows out of the body

• air pressure in the lungs increases

• chest cavity shrinks

• lung volume shrinks

• diaphragm relaxes and ribs move down and in

Which of the following mechanisms cause air to flow into your lungs when you inhale? Select all that apply.

• The pressure of air in the lungs increases.

• The pressure of air in the lungs decreases.

• The volume of the lung increases.

• The volume of lungs decreases.

Which of the following refers to the gas exchange that occurs between the capillaries in the body and the cells of the body?

• expiration

• inspiration

• external respiration

• internal respiration

Which of the following is a common mechanism used to transport both oxygen and carbon dioxide in the blood?

• bound to hemoglobin

• as bicarbonate ions

• dissolved in plasma

• as free molecules