Access Card to Accompany Stephen F. Austin State University Anatomy and Physiology/BIO 238/239
2nd Edition
ISBN: 9781259667602
Author: McKinley
Publisher: MCGRAW-HILL CUSTOM PUBLISHING
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Textbook Question
Chapter 19, Problem 5DYKB
_____ 5. Calcium channels in the nodal cells function to
- a. cause depolarization and initiate the cardiac action potential.
- b. assure excess calcium can leave the cell.
- c. bring the cell quickly to its resting membrane potential.
- d. sustain contraction of the cell.
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Select the correct one, Which of the following would not increase Cardiac Output?
A. increase blood epinephrine concentration
B. Increase Atrial Preload
C. Increase Cardiac sarcoplasmic calcium concentration
D. Increase Arterial Afterloada
Action potentials are spread rapidly between cardiac muscle cells by a. sarcomeres.
b. intercalated discs.
c. chemical neurotransmitters.
d. the fibrous skeleton.
Which of the following would NOT result from an increase in sympathetic stimulation of the heart?
A
increased force of ventricular contraction
B
increased calcium concentration in the fluid surrounding the actin and myosin during contraction
C
increased heart rate
D
increased number of motor units activated
E
increased cardiac output
Chapter 19 Solutions
Access Card to Accompany Stephen F. Austin State University Anatomy and Physiology/BIO 238/239
Ch. 19.1 - What are the potential consequences of a failing...Ch. 19.1 - Prob. 2WDYLCh. 19.1 - What path does blood follow through the heart?...Ch. 19.1 - Which of the great vessels is both an artery and...Ch. 19.2 - Prob. 5WDYLCh. 19.2 - Describe the three layers that cover the heart....Ch. 19.3 - Prob. 7WDYLCh. 19.3 - What are the layers of the heart (in order) that a...Ch. 19.3 - What is the structure that separates the two...Ch. 19.3 - What are the functions of the tendinous cords and...
Ch. 19.3 - Which features of cardiac muscle support aerobic...Ch. 19.3 - Which function of the fibrous skeleton allows the...Ch. 19.4 - What areas of the heart are deprived of blood when...Ch. 19.4 - Prob. 14WDYLCh. 19.5 - Prob. 15WDYLCh. 19.5 - Which autonomic division is associated with the...Ch. 19.6 - Prob. 17WDYLCh. 19.6 - What is autorhythmicity? Describe how nodal cells...Ch. 19.6 - What is the path of an action potential through...Ch. 19.6 - What anatomic features slow the conduction rate of...Ch. 19.7 - In which direction does Ca2+ move in response to...Ch. 19.7 - What three electrical events occur at the...Ch. 19.7 - What is the significance of the extended...Ch. 19.7 - What events in the heart are indicated by each of...Ch. 19.8 - Pressure changes that occur during the cardiac...Ch. 19.8 - What is occurring during ventricular ejection?Ch. 19.8 - Prob. 27WDYLCh. 19.8 - Define end-diastolic volume, end-systolic volume,...Ch. 19.9 - What are the two factors that determine cardiac...Ch. 19.9 - What is the cardiac output at rest and during...Ch. 19.9 - Prob. 31WDYLCh. 19.9 - Describe the atrial reflex, which involves...Ch. 19.9 - Prob. 33WDYLCh. 19.9 - Prob. 34WDYLCh. 19.10 - What would be the path of blood flow through the...Ch. 19 - Which of the following is the correct circulatory...Ch. 19 - The pericardial cavity is located between the a....Ch. 19 - How is blood prevented from backflowing from the...Ch. 19 - ____ 4. Venous blood draining from the heart wall...Ch. 19 - _____ 5. Calcium channels in the nodal cells...Ch. 19 - ____6. Action potentials are spread rapidly...Ch. 19 - Why is it necessary to stimulate papillary muscles...Ch. 19 - ____ 8. Preload is a measure of a. stretch of...Ch. 19 - ____ 9. All of the following occur when the...Ch. 19 - ____10. What occurs during the atrial reflex? a....Ch. 19 - Prob. 11DYKBCh. 19 - Compare the structure, location, and function of...Ch. 19 - Prob. 13DYKBCh. 19 - Explain why the walls of the atria are thinner...Ch. 19 - Describe the structure and function of...Ch. 19 - Explain the general location and function of...Ch. 19 - Describe the functional differences in the effects...Ch. 19 - Prob. 18DYKBCh. 19 - List the five events of the cardiac cycle, and...Ch. 19 - Define cardiac output, and explain how it is...Ch. 19 - A young man was doing some vigorous exercise when...Ch. 19 - A young man was doing some vigorous exercise when...Ch. 19 - Prob. 3CALCh. 19 - Prob. 4CALCh. 19 - During surgery, the right vagus nerve was...Ch. 19 - Prob. 1CSLCh. 19 - Prob. 2CSLCh. 19 - Your grandfather was told that his SA node...
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- 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_forwardIncreased action potentials from the sympathetic nervous system would cause which of the following? a. release of acetylcholine at sinuatrial nodal cells b. release of acetylcholine at cardiac muscle cells c. increased strength of contraction d. decreased heart ratearrow_forwardwhy are cardiac muscle cells affected by hyperkalemia? A. All choices below are correct B. Resting membrane potential becomes less negative C. Voltage across the cardiac muscle cell cannot be maintained D. The cardiac muscle cell cannot respond to a nerve stimulusarrow_forward
- In pacemaker cells the movement of __________ into the cell through voltage-gated channels is primarily responsible for the depolarization phase of the action potential. A Ca2+ ions B K+ ions C Na+ ions D Cl- ionsarrow_forwardCardiomyocytes are similar to skeletal muscle because: a. they beat involuntarily b. they are used for weight lifting c. they pulse rhythmically d. they are striatedarrow_forwardHow would the left ventricle of a patient who had had high blood pressure for many years differ from the left ventricle of a normal heart? A it would have a larger volume of muscle B it would have a smaller volume of muscle C it would be smaller than the right ventricle D chronic high blood pressure would weaken the heart valves but would have no anatomical effects on the walls of the ventriclesarrow_forward
- During the refractory period a second action potential______. A cannot occur because voltage-gated Na+ channels are inactivated B cannot occur because the heart muscle cell has already returned to resting potential C can be initiated more easily because the threshold potential is reduced D can be initiated more easily because the calcium level in the sarcoplasm is increasedarrow_forwardIn a patient given a cardiac glycoside, important effects of the drug on the heart include which of the following? a) Increased force of contraction. b)Decreased atrioventricular conduction velocity c)Decreased ejection time d)Increased ectopic automaticityAll of the abovearrow_forwardFill in the blank: Parasympathetic nerve fibers that supply the heart make up part of the _______________________ nerve.arrow_forward
- Figure shows the conduction system of the heart that transmit the electrical impulses for the coordination of cardiac cycle. a) Referring to the Figure , which part of the heart's electrical conduction is known as the “pacemaker” of the heart? b)Explain how D controls atria and ventricles which causes ventricular systole.arrow_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_forwardA 55-year-old man has been diagnosed with Stokes-Adams syndrome. Two minutes after the syndrome starts to cause active blockade of the cardiac impulse, which of the following is the pacemaker of the heart? A) Sinus node B) A-V node C) Purkinje fibers D) Cardiac septum E) Left atriumarrow_forward
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