Q. No.During expiration, the diaphragm and external intercostal muscles are:
1. contracted
2. relaxed
3. flexed
4. both relaxed (diaphragm) and flexed (intercostal muscles)
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The part of the human brain where the main respiratory center is located is:
| 1. | pons varolii | 2. | cerebrum |
| 3. | medulla oblongata | 4. | thalamus |
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The respiratory center in humans can be primarily stimulated by:
1. carbon dioxide and hydrogen ions
2. oxygen gas levels in the blood
3. oxygen gas levels in the hemoglobin
4. conscious feeling for the need for more oxygen
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The peripheral chemoreceptors in carotid and aortic bodies respond to:
1. hydrogen ion concentration.
2. levels of carbon dioxide in the blood.
3. levels of oxygen in the blood.
4. all of the above
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What will happern to the rate and depth of breathing when blood carbon dioxide rises?
| 1. decreases | 2. increases |
| 3. stays the same | 4. stops |
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Both carbon dioxide and oxygen move across the respiratory membrane due to:
| 1. gravity | 2. blood pressure |
| 3. diffusion | 4. active transport |
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With respect to the atmospheric air, the deoxygenated blood flowing into lung capillaries has a higher concentration of:
| 1. oxygen | 2. both carbon dioxide and oxygen |
| 3. carbon monoxide | 4. carbon dioxide |
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Hemoglobin carrying carbon dioxide is called as:
| 1. Deoxyhemoglobin | 2. Carbaminohemoglobin |
| 3. Carboxyhemoglobin | 4. Oxyhemoglobin |
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A measure of the amount of air a person inhales during a normal breath is:
| 1. inspiratory reserve volume | 2. vital capacity |
| 3. total lung capacity | 4. tidal volume |
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The amount of air that remains in a person's lungs after fully exhaling is known as:
| 1. tidal volume | 2. expiratory reserve volume |
| 3. vital capacity | 4. residual volume |
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