Respiratory System Quiz 3

Air being inhaled contains 21% oxygen, equal to a PO2 of 160 mmHg. As this air mixes with air already in the alveoli, the PO2 decreases.

• True

• False

At the PO2 in the tissues, hemoglobin will be 75% saturated.

• True

• False

What protein can transport some of the carbon dioxide in the blood?

• Hemoglobin

• Carbonic anhydrase

• Heme

• Albumin

Why are smokers more susceptible to respiratory infections?

• They congregate in small areas to smoke, increasing their exposure to exhaled smoke.

• Their respiratory passages overproduce cilia, to which bacteria cling.

• Their respiratory passages lose cilia, which would otherwise remove bacteria.

• Their respiratory passages have too little mucus and are unable to trap inhaled particles.

Differentiate between minute ventilation and alveolar ventilation.

• Minute ventilation is the volume of air moved into the respiratory passages each minute. Alveolar ventilation is the volume of air that reaches the alveoli each minute.

• Minute ventilation is the volume of air that reaches the alveoli each minute. Alveolar ventilation is the volume of air that moved into the respiratory passages each minute.

• Minute ventilation is the number of breaths taken each minute. Alveolar ventilation is the amount of air in the alveoli each minute.

• Minute ventilation is the volume of air moved into the upper respiratory tract each minute. Alveolar ventilation is the volume of air moved into the lower respiratory tract each minute.

The volume of air called __________ is the portion of inhaled air that does not reach the alveoli and, therefore, does not participate in gas exchange.

• alveolar dead space

• anatomic dead space

• minute ventilation

• alveolar ventilation

What is the result of the peripheral chemoreceptors being stimulated and sending impulses to the respiratory areas?

• increased respiratory rate

• decreased respiratory rate

• respiratory collapse

• passive exhalation

Which of the following has an effect on the pH of blood?

• oxygen

• phosphate

• carbon dioxide

• nitrogen

The presence of __________ in the alveoli ensure that particles brought in with inhaled air are removed.

• surfactant

• antibodies

• macrophages

• lymphocytes

Differentiate between type I and type II cells of the lungs.

• The type I cells secrete surfactant and the type II cells will give rise to bronchiolar smooth muscle cells.

• The type I cells form alveolar walls and the type II cells secrete surfactant.

• Both type I and type II cells produce surfactant.

• The type I cells produce cartilage for larger airways and the type II cells give rise to the ciliated cells lining the trachea.