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| 1 | |
The ________ project from the lateral walls of the nasal cavity increasing its surface area. |
| | A) | nasal bones |
| | B) | nasal conchae |
| | C) | palatine tonsils |
| | D) | palatine bones |
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| 2 | |
From the nasal cavity, air passes, in sequence, through the _________ on the way to the lungs. |
| | A) | pharynx, larynx, trachea and bronchi |
| | B) | larynx, pharynx, trachea and bronchi |
| | C) | larynx, trachea, pharynx and bronchi |
| | D) | pharynx, trachea, larynx and bronchi |
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| 3 | |
When swallowing, food is prevented from entering the trachea by the |
| | A) | vocal cords. |
| | B) | epiglottis. |
| | C) | glottis. |
| | D) | tongue. |
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| 4 | |
________ and smaller air passages of the bronchial tree are not lined with ciliated mucous membranes. |
| | A) | Alveolar ducts |
| | B) | Secondary bronchi |
| | C) | Bronchioles |
| | D) | Primary bronchi |
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| 5 | |
Gas exchange in the lungs occurs between air in the __________ and blood in surrounding capillaries. |
| | A) | bronchioles |
| | B) | alveoli |
| | C) | bronchial tree |
| | D) | None of these choices. |
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| 6 | |
Without surfactant, the _________ would collapse preventing inspiration. |
| | A) | bronchioles |
| | B) | alveoli |
| | C) | bronchi |
| | D) | lungs |
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| 7 | |
________ of the diaphragm decreases intra-alveolar pressure resulting in ________. |
| | A) | Contraction; inspiration |
| | B) | Contraction; expiration |
| | C) | Relaxation; inspiration |
| | D) | Relaxation; expiration |
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| 8 | |
The maximum amount of air that can be forcefully exchanged, the ________, is about 4,600 ml. |
| | A) | tidal volume |
| | B) | inspiratory capacity |
| | C) | expiratory reserve |
| | D) | vital capacity |
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| 9 | |
The respiratory center in the ________ coordinates the rhythmic inspiration and expiration of quiet breathing. |
| | A) | pons |
| | B) | medulla oblongata |
| | C) | cerebellum |
| | D) | cerebrum |
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| 10 | |
The expiratory center in the _________ stimulates forceful expirations. |
| | A) | pons |
| | B) | medulla oblongata |
| | C) | cerebellum |
| | D) | cerebrum |
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| 11 | |
A moderate ________ in the blood stimulates an increase in breathing rate and depth. |
| | A) | increase in oxygen concentration |
| | B) | decrease in oxygen concentration |
| | C) | increase in carbon dioxide concentration |
| | D) | decrease in hydrogen ion concentration |
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| 12 | |
The exchange of oxygen and carbon dioxide between air in alveoli and blood in capillaries occurs by |
| | A) | filtration. |
| | B) | active transport. |
| | C) | diffusion. |
| | D) | osmosis. |
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| 13 | |
The chemical bond between oxygen and hemoglobin is |
| | A) | stable and irreversible. |
| | B) | unstable and reversible. |
| | C) | unstable and irreversible. |
| | D) | dependent upon carbonic anhydrase. |
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| 14 | |
Carbon dioxide is primarily transported as |
| | A) | carbonic anhydrase. |
| | B) | carbaminohemoglobin. |
| | C) | carbonic acid. |
| | D) | bicarbonate ions. |
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| 15 | |
Carbonic anhydrase catalyzes the reaction of carbon dioxide and water to form |
| | A) | bicarbonate and hydrogen ions. |
| | B) | carbaminohemoglobin. |
| | C) | carbonic acid. |
| | D) | bicarbonate ions. |
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