Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 40, Problem 11RQ

The heart's internal pacemaker beats by:

  1. an internal implant that sends an electrical impulse through the heart
  2. the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node
  3. the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node
  4. the action of the sinus

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The cardiac cycle includes all the events associated with the flow of blood through the heart during a single complete heartbeat. Indicate if the following statements are True/False. The louder, sharper, higher-pitched 'dupp' heart sound occurs when tricuspid and mitral valves close.
Which of the following factors does not directly affect cardiac output? the volume of blood ejected with each contraction the stroke volume the rate of heart contraction resistance in the vasculature
The heart’s pacemaker is called the (complete term)_________. The pacemaker is composed of specialized________. The pacemaker first sends impulses that stimulate contraction of both_______. The (complete term)________introduces a delay in the transmission of pacemaker signals into the ventricles. Signals are conducted from this node directly into fibers called the________ . If the pacemaker loses control of heart contractions, ineffective quivering of the heart muscle, called_________, may occur.
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The Cardiovascular System: An Overview; Author: Strong Medicine;https://www.youtube.com/watch?v=Wu18mpI_62s;License: Standard youtube license