Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
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Question
Chapter 18, Problem 4RQ
Summary Introduction
Introduction:
The components of the cardiopulmonary system may get stressed to their limits, during heavy exercise. The increased cardiac output decides the duration and intensity of the exercise. The circulatory system and muscles are equally important in setting up the limits for the exercise. There are some physiological changes that occur in response to the heavy exercise, in order to supply enough amount of blood to the muscles.
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Parasympathetic stimulation of the sinoatrial node ______.
A
is necessary; without it the heart would stop beating
B
lowers the heart rate
C
increases the heart rate
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does not occur; the heart receives no neural stimulation
There is reduced blood flow to tissues and organs in cardiogenic shock. What is the main cause of this reduced blood flow?
Question 4 options:
a)
A decrease in systemic vascular resistance
b)
A reduction in preload
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A reduction in cardiac output
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The loss of sympathetic tone
Heart failure occurs when
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all of the above
Chapter 18 Solutions
Cardiopulmonary Anatomy & Physiology
Ch. 18 - Prob. 1RQCh. 18 - 2. The maximum alveolar ventilation generated...Ch. 18 - 3. During heavy exercise, the total cardiac output...Ch. 18 - Prob. 4RQCh. 18 - Prob. 5RQCh. 18 - Prob. 6RQCh. 18 - During exercise, the oxygen consumption (VO2) of...Ch. 18 - During very heavy exercise, the 1. pH increases 2....Ch. 18 - 9. During maximum exercise, the oxygen diffusion...Ch. 18 - During exercise, the P(A=a)O2 begins to increase...
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- Contraction of the smooth muscle layers of the arterioles a. increases the frictional resistance to blood flow. b. may be a way of increasing heat exchange through the skin. c. can increase blood flow to an organ. d. All of the choices are correct.arrow_forwardIf the sinoatrial node stopped generating action potentials the heart would _____. A stop beating because the sinoatrial node is the heart's pacemaker B beat with a slower frequency due to the spontaneous depolarization of the AV node C go into fibrillation immediately because the heart cells would no longer function in a coordinated rhythm D continue to beat normally because the sympathetic neurons going to the cardiomyocytes would initiate the depolarizationarrow_forwardA stroke results froma. hemorrhage in the brain.b. a blockage of a blood vessel in the brain.c. a deficiency of tissue plasminogen activator.d. Both a and b are correct.arrow_forward
- Tissue plasminogen activator (tPA) is helpful in reducing the effect of a stroke only under which of these conditions?A. It is helpful only if the stroke was due to a hemorrhage.B. It is helpful only if administered within the first hours after a stroke.C. It is helpful only if the patient practices relevant movements while taking the drug.D. It is effective only for laboratory animals, not for humans.arrow_forwardThe most common disorder affecting the heart and blood vessels is ? A. arrhythmia B. Hypertension C.Aneurysm D. infarctionarrow_forwardThe left ventricular wall of the heart is thicker than the right wall in order to ________. A accommodate a greater volume of blood B expand the thoracic cage during diastole C pump blood with greater pressure D pump blood through a smaller valvearrow_forward
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