Human Anatomy & Physiology (2nd Edition)
2nd Edition
ISBN: 9780134553511
Author: Erin C. Amerman
Publisher: PEARSON
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Textbook Question
Chapter 17, Problem 11CYR
The AV node delay:
a. allows the atria and ventricles to depolarize and contract as a unit.
b. allows the two ventricles to depolarize and contract separately.
c. allows the atria and ventricles to depolarize and contract separately.
d. speeds up the impulse transmission from the atria to the ventricles.
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The AV node delay: a. allows the atria and ventricles to depolarize and contract as a unit. b. allows the two ventricles to depolarize and contract separately. c. allows the atria and ventricles to depolarize and contract separately. d. speeds up the impulse transmission from the atria to the ventricles
Which of the following statements is true about the SA (sinoatrial) node?
a. The action potential created by the pacemaker cells of the SA node directly stimulates the contractile cells of both the atria and ventricles.
b. The rate of spontaneous depolarization of nodal cells is the fastest in the SA node.
c. Pacemaker cells in the SA node form a pathway between the SA and AV nodes.
d. The pacemaker cells, which establish the heart rate, are located only in the SA node.
The QRS wave of an ECG (or EKG) represents:
a. depolarization of the ventricles.
b. Depolarization and repolarization of the ventricles.
c. Depolarization of the atria and ventricles.
d. depolarization of the atria.
Chapter 17 Solutions
Human Anatomy & Physiology (2nd Edition)
Ch. 17.1 - Where is the heart located, and how large is it?Ch. 17.1 - What are the hearts upper and lower chambers...Ch. 17.1 - What are the sources from which blood flows into...Ch. 17.1 - 4. Which side of the heart is considered the...Ch. 17.1 - Which side of the heart is considered the systemic...Ch. 17.2 - Prob. 1QCCh. 17.2 - Prob. 2QCCh. 17.2 - 3. What are the three layers of the heart wall,...Ch. 17.2 - 4. What are the four main great vessels? From...Ch. 17.2 - How do the right and left ventricles differ in...
Ch. 17.2 - 6. Why do you think it is important to ensure via...Ch. 17.2 - 7. What is the overall pathway of blood flow...Ch. 17.2 - Prob. 8QCCh. 17.2 - Prob. 9QCCh. 17.2 - Prob. 10QCCh. 17.3 - How do pacemaker and contractile cells differ?...Ch. 17.3 - 2. What are intercalated discs? What is their...Ch. 17.3 - Prob. 3QCCh. 17.3 - Prob. 4QCCh. 17.3 - What is the sequence of events of a contractile...Ch. 17.3 - How does the refractory period of cardiac muscle...Ch. 17.3 - 7. What does an ECG record?
Ch. 17.3 - What are the five waves in an ECG, and what do...Ch. 17.4 - What causes the heart sounds S1 and S2?Ch. 17.4 - Prob. 2QCCh. 17.4 - Prob. 3QCCh. 17.4 - Is the end-diastolic or the end-systolic volume of...Ch. 17.4 - 5. Walk through the mechanical events of the...Ch. 17.4 - 6. Relate the ECG waves to the cardiac cycle...Ch. 17.4 - 7. How does the left ventricular pressure...Ch. 17.5 - Prob. 1QCCh. 17.5 - What is cardiac output? How does it relate to...Ch. 17.5 - Prob. 3QCCh. 17.5 - What is the Frank-Starling law, and how does it...Ch. 17.5 - What is a chronotropic agent?Ch. 17.5 - Prob. 6QCCh. 17.5 - 7. What effects does the parasympathetic nervous...Ch. 17.5 - How would a hormone that decreases the amount of...Ch. 17.5 - How is heart failure defined?Ch. 17 - 1. Mark the following statements as true or false....Ch. 17 - 2. The pericardial cavity is located between:
a....Ch. 17 - 3. Which of the following statements is true?
a....Ch. 17 - Match the following terms with the correct...Ch. 17 - Fill in the blanks: The coronary arteries are the...Ch. 17 - 6. How do pacemaker cardiac muscle cells differ...Ch. 17 - 7. Cardiac muscle cells are joined by structures...Ch. 17 - Prob. 8CYRCh. 17 - Prob. 9CYRCh. 17 - 10. The _________is the primary pacemaker of the...Ch. 17 - The AV node delay: a. allows the atria and...Ch. 17 - Explain what each of the following terms...Ch. 17 - 13. Mark the following statements as true or...Ch. 17 - Prob. 14CYRCh. 17 - 15. Fill in the blanks: The first heart sound is...Ch. 17 - Cardiac output is equal to: a. end-diastolic...Ch. 17 - Prob. 17CYRCh. 17 - 18. Which of the following statements is false?
a....Ch. 17 - 1. A birth defect called transposition of great...Ch. 17 - 2. Predict which would be more damaging to...Ch. 17 - 3. When the SA node doesn’t function properly, the...Ch. 17 - Prob. 4CYUCh. 17 - Prob. 1AYKACh. 17 - Prob. 2AYKACh. 17 - Prob. 3AYKACh. 17 - Prob. 4AYKB
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- Conduction of a neural signal through the walls of the ventricles of the heart is accomplished along: A. Interatrial Fibers B. The sinoatrial node C. The AV bundle D. The purkinje fibersarrow_forwardWhy is it necessary to stimulate papillary muscles in the ventricle slightly earlier than the rest of the ventricular wall myocardium? a. to assure rapid conduction speed of the action potential b. to pull on AV valve cusps to prevent backflow c. to assure blood will surge toward the semilunar valves d. to assure coordinated contraction of the ventricular myocardiumarrow_forwardThe QRS wave of an ECG is produced by. a. depolarization of the atria. b. repolarization of the atria. c. depolarization of the ventricles. d. repolarization of the ventricles.arrow_forward
- Which of the following statement/s is/are not true regarding phases of cardiac cycle? A. Atrial systole is followed by ventricular systole. B. When the ventricles are in systole, the atria are in diastole. C. The atria continually receive blood from the veins. D. As pressure within the atria increases, the mitral valve is opened. E. All statements are true.arrow_forwardWhich of the following is/are true concerning the opening and closing of the cardiac valves? A. valves operate according to the pressures on either side of the valve B. valve operation is constantly being controlled by the medulla oblongata C. valve operation is determined directly by the cardiac action potential (electrical currents control the opening and closing of the valves.) D. valve operation is directly controlled by the papillary muscles within the ventricular wall. E. None of the above is correct.arrow_forwardThe delivery of blood by the left ventricle into the sorta is intermittent, whereas blood flow in the peripheral circulation is usually continuous. Which of the following best explains this difference? A. Arteries contain more elastic tissue than veins . B Capillary walls contain little elastic or muscular tissue . C. Continuous flow is needed to meet metabolic requirements. D. Passive recoil of the arteries delivers blood to the periphery during diastole E . Rhythmic contractions of arterial smooth muscie increase the diastolic pressure to above zeroarrow_forward
- Which of the following is not true for conduction of the cardiac impulse? A. Action potentials propagate by current flow through gap junctions. B. Slow propagation occurs due to high longitudinal resistance. C. Slow propagation requires a slower (sustained) current source (i.e. Ca). D. Fast propagation occurs as a result of high intercellular conductance. E. All are true.arrow_forwardIncreased parasympathetic stimulation of the hearta. increases the force of ventricular contraction.b. increases the rate of depolarization in the SA node.c. decreases heart rate.d. increases cardiac outputarrow_forwardDuring isovolumetric relaxation, the atrioventricular and semilunar valves are: a. open and ventricular pressure is increasing. b. closed, and ventricular pressure is decreasing, c. closed and ventricular pressure is increasing. O d. closed and ventricular pressure is decrea ing. O e. open and ventricular pressure is decreasing.arrow_forward
- An ECG measures a. changes in electrical potential during the cardiac cycle. b. Ca2+ concentration of the ventricles in diastole. c. the force of contraction of the atria during systole. d. the volume of blood being pumped during the contraction cycle.arrow_forwardSA node is the main pacemaker of the heart. Why is the normal heart rate lower than the intrinsic firing rate of the SA node? A. sympathetic inputs from the hypothalamus are slowing it down B. parasympathetic inputs from medulla oblongata are slowing it down C. there is inertia in heart muscle as it takes time for impulse to spread through all the cells D. centrifugal inputs from the AV node are slowing it downarrow_forwardIn a healthy young adult, what happens to cardiacoutput when heart rate increases above 160 bpm?a. It increases.b. It decreases.c. It remains constant.d. There is no way to predictarrow_forward
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