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30 Cards in this Set
- Front
- Back
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Stimulation of the sympathetic nerves to the heart increases stroke volume.
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True.
(cardiac output = SV x heartrate) |
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A decrease in cardiac output causes an increase in blood pressure.
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False. As cardiac output increases, BP increases.
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Baroreceptors are responsible for detecting changes in BP.
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True.
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Arteries have smooth muscles in their walls.
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True.
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An increase in sympathetic nerve activity causes a decrease in TPR.
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False.When sympathetic nerves are activated, vascular smooth muscle CONTRACTS, increasing resistance. When sympathetic nerves in inhibited, vsm relaxes.
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In arteries, hemoglobin is 40% saturated with 02.
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False.
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Hyperventilation will cause a fall in PC02 levels.
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True...since you are breathing out more CO2 than normally.
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Bronchodilation causes an increase in airway resistance.
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False. Bronchodilation causes a decrease in resistance, while bronchoconstriction causes an increase in resistance.
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Central respiratory chemoreceptors are sensative to the pH of cerebrospinal fluid due o the PC02 in plasma.
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True.
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During expiration, the volume of the lung decreases.
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True. If vol decreases, pressure increases. Air flows from area of higher pressure (in the lung) to lower pressure (outside air).
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ADH reduces the rate of glomerular filtration.
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False. ADH inhibits urine production and causes the kidnsets to reabsorb MORE water.
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The fluid at the tip of the loop of Henle has an osmolarity of 100 milliosmoles/kg.
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False.
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Reabsorprtion of water occurs in the descending loop of Henle.
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True.
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Glucose is not filtered by the glomerulus.
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False.
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The osmolarity of the kidney medulla is the same as that of the cortex.
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False.
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Water is absorbed mainly from the large intestine.
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True.
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Bile pigments are reabsorbed in the small intestine.
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True.
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Gastric glands secrete pepsin only.
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False.
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Swallowing is entirely voluntary.
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False. While the oral phase is voluntary, the pharyngeal and esophageal phases are involuntary.
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Intrinsic factor is released by the small intestine.
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False. Intrinsic factor is released by the parietal cells of the stomach. (It is required to digest Vit. B12)
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Slow waves in the small intestine are initiated at the interstitial cells of Cajal.
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True.
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Secretion of pituitary hormones is regulated by negative feedback mechanisms.
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True.
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The adrenal cortex is under control of the anterior pituitary.
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True.
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Oxytocin is repsonsible for regulating blood calcium levels.
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False. Calcitonin and PTH control calcium levels in the body. Oxytocin stimulates uterine contraction and the secretion of milk from a mother's breasts.
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Thyroid hormones increase metabolic rate.
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True.
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Aldosterone is secreted by the adrenal cortex.
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True
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Parathyroid hormone increases the concentration of calcium in the blood.
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True.
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FSH stimulates spermatogenesis.
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True.
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Testosterone is a water soluble hormone.
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False.
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Progesterone is secreted by thr corpus luteum.
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True.
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