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1 | |
All sympathetic nerve fibers to the heart lead to the sinoatrial (SA) node. (p. 410) |
| | A) | True |
| | B) | False |
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2 | |
Cardiac control centers in the medulla oblongata receive input from baroreceptors located in some of the arteries. (p. 411) |
| | A) | True |
| | B) | False |
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3 | |
Stroke volume is directly proportional to peripheral resistance. (p. 411) |
| | A) | True |
| | B) | False |
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4 | |
The heart's contractility is adjusted so that normally each ventricle expels all the blood contained in it, leaving none behind in the chamber. (p. 411) |
| | A) | True |
| | B) | False |
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5 | |
The parasympathetic nervous system has no significant effect on the contraction strength of the ventricles. (p. 412) |
| | A) | True |
| | B) | False |
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6 | |
If the ventricles did not fill with blood at all, but the electrical conduction system stimulated them to contract anyway, the contraction would be very weak. (p. 412) |
| | A) | True |
| | B) | False |
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7 | |
In spite of the fact that the systemic vessels cover substantially more total length than the pulmonary vessels, the same amount of blood must flow through both of these systems in a given time. (p. 413) |
| | A) | True |
| | B) | False |
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8 | |
Something with a positive inotropic effect on the heart increases the contractility of the muscle fibers. (p. 413) |
| | A) | True |
| | B) | False |
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9 | |
Since arteries are more muscular than veins, they are said to have a greater compliance.(p. 413) |
| | A) | True |
| | B) | False |
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10 | |
Since the veins contain most of the body's blood at any one time, they have a higher blood pressure than any other type of vessel. (p. 413) |
| | A) | True |
| | B) | False |
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11 | |
About 80% of the body's extracellular fluid is in the cells. (p. 414) |
| | A) | True |
| | B) | False |
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12 | |
The net filtration pressure of the capillaries is mathematically equal to the hydrostatic pressure that tends to promote filtration minus the osmotic pressure than tends to promote absorption. (p. 414) |
| | A) | True |
| | B) | False |
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13 | |
The oncotic pressure of the blood tends to promote uptake of water from the tissue fluid into the blood plasma. (p. 415) |
| | A) | True |
| | B) | False |
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14 | |
If the Starling forces formula, (Pc+ pi) - (Pi + pp), yields a negative number, it means the net Starling forces promotes absorption of fluid into a capillary. (p. 415) |
| | A) | True |
| | B) | False |
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15 | |
All fluid that is filtered at the arteriolar end of a capillary and percolates through the tissues must be reabsorbed at the venular end in order to maintain plasma fluid balance. (p. 416) |
| | A) | True |
| | B) | False |
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16 | |
Liver disease tends to reduce the blood pressure and lead to edema. (p. 417) |
| | A) | True |
| | B) | False |
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17 | |
All of the fluid filtered by the capillaries of the kidneys is ultimately excreted as urine. (p. 417) |
| | A) | True |
| | B) | False |
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18 | |
Less urine is excreted when the ADH level is high. (p. 417) |
| | A) | True |
| | B) | False |
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19 | |
Increased osmolality of the blood leads to increased secretion of ADH. (p. 417) |
| | A) | True |
| | B) | False |
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20 | |
Both ADH and aldosterone promote retention of water when one is dehydrated, but aldosterone does not lower the blood osmolality. (p. 418) |
| | A) | True |
| | B) | False |
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21 | |
Angiotensinogen is secreted by the kidneys and then converted in the lungs to the vasoconstrictor named angiotensin II. (p. 419) |
| | A) | True |
| | B) | False |
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22 | |
Parasympathetic fibers innervating blood vessels are always cholinergic and stimulate vasodilation. (p. 423) |
| | A) | True |
| | B) | False |
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23 | |
All blood vessels receive both sympathetic and parasympathetic nerve fibers so their diameters can be regulated by a balanced "push-pull" homeostatic control mechanism. (p. 423) |
| | A) | True |
| | B) | False |
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24 | |
The sympathetic nervous system is much more important than the parasympathetic system in regulating arterial blood flow. (p. 423) |
| | A) | True |
| | B) | False |
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25 | |
A drop in arterial blood pressure causes cerebral arteries to dilate. (p. 429) |
| | A) | True |
| | B) | False |
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26 | |
Blood flow through the coronary arteries is greatest during ventricular systole and drops during diastole. (p. 425) |
| | A) | True |
| | B) | False |
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27 | |
Coronary blood flow is reduced during systole so the myocardium must temporarily rely on anaerobic respiration. (p. 425) |
| | A) | True |
| | B) | False |
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28 | |
Sustained muscle contractions will cause faster onset of fatigue than a series of short contractions because the blood flow through a skeletal muscle is diminished or shut off during strong contractions. (p. 426) |
| | A) | True |
| | B) | False |
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29 | |
During heavy exercise, blood circulation to the skin increases to dissipate the excess heat the body generates. (p. 427) |
| | A) | True |
| | B) | False |
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30 | |
During heavy exercise, the heart beats faster and has less time to fill between beats, so the end-diastolic volume is reduced. (p. 428) |
| | A) | True |
| | B) | False |
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31 | |
Cerebral blood flow remains fairly constant at about 750 ml/min, in spite of changes in brain activity, blood pressure, and blood flow to other organs. (p. 429) |
| | A) | True |
| | B) | False |
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32 | |
Cerebral arteries constrict when blood pressure rises to about 200 mmHg. (p. 429) |
| | A) | True |
| | B) | False |
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33 | |
The skin is vital to thermoregulation of the body and therefore cannot tolerate a reduced flow of blood for very long. (p. 429) |
| | A) | True |
| | B) | False |
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34 | |
Heart rate is controlled by vasomotor control centers in the medulla oblongata. (p. 432) |
| | A) | True |
| | B) | False |
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35 | |
The baroreceptor reflex responds to changes in blood pressure to increase or decrease heart rate and total peripheral resistance. (p. 432) |
| | A) | True |
| | B) | False |
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36 | |
Orthostatic hypotension is due to a defect of the baroreceptor reflex. (p. 433) |
| | A) | True |
| | B) | False |
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37 | |
The sounds of Korotkoff are created by the closing of atrioventricular and semilunar valves.(p. 435) |
| | A) | True |
| | B) | False |
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38 | |
Laminar blood flow cannot be heard with the stethoscope on the brachial artery. (p. 435) |
| | A) | True |
| | B) | False |
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39 | |
In the auscultatory method of taking blood pressure, no sound is heard above the systolic pressure because the laminar flow of blood is silent. (p. 435) |
| | A) | True |
| | B) | False |
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40 | |
Pulse pressure is obtained by multiplying blood pressure by pulse rate. (p. 434) |
| | A) | True |
| | B) | False |
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41 | |
If a person had an arterial blood pressure of 102/62, the mean arterial pressure would be 82 mmHg. (p. 437) |
| | A) | True |
| | B) | False |
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42 | |
Essential hypertension is high blood pressure of unknown cause. (p. 438) |
| | A) | True |
| | B) | False |
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43 | |
Hypertension should inhibit the production of renin, so it follows that most hypertensive patients have lower than normal plasma renin levels. (p. 438) |
| | A) | True |
| | B) | False |
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44 | |
By the time a patient shows any symptoms of hypertension, there usually has already been considerable damage to the circulatory system. (p. 438) |
| | A) | True |
| | B) | False |
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45 | |
Hypertension can be treated with diuretic drugs. (p. 439) |
| | A) | True |
| | B) | False |
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46 | |
Hypovolemic shock results from an infection. (p. 440) |
| | A) | True |
| | B) | False |
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47 | |
Hypovolemic shock tends to cause a patient to have a rapid pulse and cold, clammy skin. (p. 440) |
| | A) | True |
| | B) | False |
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2002 McGraw-Hill Higher Education