GCSF2013 RESPIRATORY SYSTEM QUIZ 1

What is the largest cartilage in the larynx that forms the Adam's apple?

• Epiglottis

• Cricoid cartilage

• Thyroid cartilage

• Arytenoid cartilage

Which of the following is not a function of the pseudostratified ciliated columnar epithelium of the nasal cavity?

• Warms the air

• Moisturizes the air

• Traps dirt and debris from inhaled air

• Exchanges oxygen and carbon dioxide

The lungs have

• one blood flow route and one lymphatic supply.

• two blood flow routes and one lymphatic supply.

• one blood flow route and two lymphatic supplies.

• two blood flow routes and two lymphatic supplies.

During inspiration, the diaphragm _______ and the volume of the thoracic cavity _________, whereas during expiration, the diaphragm _________ and the volume of the thoracic cavity ___________.

• relaxes; increases; contracts; decreases

• contracts; increases; relaxes; decreases

• relaxes; decreases; contracts; increases

• contracts; decreases; relaxes; increases

Surfactant facilitates alveolar ventilation by

• decreasing thoracic compliance.

• attracting water to the alveolar surface.

• increasing the surface area for gas exchange.

• decreasing the surface tension between water molecules on the lining of the alveoli.

Calculate the alveolar ventilation if the tidal volume is 500 ml., the respiratory rate is 12/minute, and the anatomical dead space is 100 ml.

• 1200 ml

• 1800 ml

• 4800 ml

• 6000 ml

If the total pressure of a mixture of gases was 760 mm Hg and its composition is 20% oxygen, 0.04% carbon dioxide, 75% nitrogen, and 5% water vapor, then the partial pressure of oxygen would be

• 20 mm Hg.

• 148 mm Hg.

• 152 mm Hg.

• 740 mm Hg.

Which of the following does not influence the rate of gas diffusion across the respiratory membrane?

• Temperature of the gases

• Diffusion coefficients of the gases

• Thickness of the respiratory membrane

• Partial pressure gradients of the gases

In which of the following sequences does PO₂ progressively decrease?

• Systemic tissues, arterial blood, alveolar air

• Systemic tissues, alveolar air, arterial blood

• Blood in aorta, atmospheric air, systemic tissues

• Atmospheric air, blood in aorta, systemic tissues

Which of the following is the respiratory center responsible for inspiration?

• Dorsal respiratory groups

• Ventral respiratory groups

• Pontine respiratory groups

• Both the dorsal and ventral respiratory groups