Cardiopulmonary Anatomy & Physiology
7th Edition
ISBN: 9781337794909
Author: Des Jardins, Terry.
Publisher: Cengage Learning,
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Textbook Question
Chapter 12, Problem 5RQ
Which of the following slows the heart rate and AV conduction?
A. Resting membrane potential
B. Parasympathetic nervous system
C. Pacemaker
D. Phase 0
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Students have asked these similar questions
which of the following is TRUE for a cardiac cycle?
a. it only includes pressure changes that occur during one heart beat
b. it refers to volume changes that occur in one heart beat
c. it includes mechanical events during one complete heart beat
d. it refers to electrical activity of the heart during one complete heart beat
Which of the following is the correct term to indicate that the heart muscle is the source of the electrical
signal that stimulates heart contraction?
a. Myogenic
b. Myopathy
c. Myocardium
d. Myotonia
e. Myositis
SA 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 down
Chapter 12 Solutions
Cardiopulmonary Anatomy & Physiology
Ch. 12 - 1. Which of the following is the rapid upstroke in...Ch. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - Which of the following slows the heart rate and AV...Ch. 12 - Prob. 6RQCh. 12 - Prob. 7RQCh. 12 - Which of the following means the ability to...Ch. 12 - An electrical difference across the fibers of the...Ch. 12 - Prob. 10RQ
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- Which of the following slows the heart rate and AV conduction?A. Resting membrane potentialB. Parasympathetic nervous systemC. PacemakerD. Phase 0arrow_forwardThe heart’s internal pacemaker beats by: a. an internal implant that sends an electrical impulse through the heart b. the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node c. the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node d. the action of the sinusarrow_forwardThe effects of the sympathetic and parasympathetic neurons on the heart can best be described as a. antagonistic b. identical c. cooperative d. adrenergicarrow_forward
- a calcium channel blocker or an antagonist drug will produce a. vasoconstriction b. increase in blood pressure c. increase in total peripheral resistance d. reduction in cardiac muscle contractilityarrow_forwardWhich of the following statement/s is/are not true about regulation of heart rate? A. The brainstem contains the cardiac centers which are the accelerator center and the inhibitory center. (medulla) B. Sympathetic impulses to the heart increase rate and force of contraction. C. Parasympathetic impulses from cranial nerve X to the heart causes reduction in the heart rate. D. The cranial nerve IX is motor for the carotid receptors. (sensory)arrow_forwardContractions in the heart are controlled via a well-regulated electrical signaling cascade that originates in pacemaker cells in the _______ node and is passed via internodal atrial pathways to the ________, the __________, the___, and to all parts of the _________. A. sinoatrial node B. ventricle C. Purkinje system D. Bundle of His E. atrioventricular nodearrow_forward
- All of the following mechanisms assist in returning venous blood to the heart except: a. an increase in heart rate b. pressure changes in the abdominal and thoracic cavities due to breathing c. contraction of skeletal muscles in the legs d. one-way valves located inside veinsarrow_forwardWhich of the following has a correct sequence in cardiac cycle? A. Atrial depolarization → Ventricular diastole → T-wave B. Atrial diastole → Closing of tricuspid valve → Early ventricular diastole C. Ventricular repolarization → Ventricular contraction → P-wave D. Ventricular diastole → Opening of the pulmonic valve → Atrial systolearrow_forwardThis diagram shows a _______ and the green things being released into the space are _____. A. cardiac pace maker cell; calcium B. sarcoplasmic reticulum; calcium C. synapse; Sodium ions D. neuromuscular junction; neurotransmittersarrow_forward
- Which of the following is NOT a population of pacemaker cells in the heart? a. papillary muscles b. sinoatrial (SA) node c. atrioventricular (AV) node d. Purkinje fiber systemarrow_forwardWhich 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 Afterloadarrow_forwardWhich of the following is true about the pacemaker potential in the heart? a. Decreased K+ efflux causes the resting membrane potential to increase b. Action potential occurs when T-type Ca2+ channels open c. Only the SA node in the heart has a pacemaker potential d. The atrioventricular node is needed to pace the sinoatrial node e. None of the options are truearrow_forward
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