Cardiovascular System: Heart Chambers and Pumping Function

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Questions and Answers

Which type of muscle in the heart exhibits automatic rhythmical electric discharge?

  • Atrial muscle
  • Conductive muscle fibers (correct)
  • Specialized excitatory muscle
  • Ventricular muscle

What is the main function of the atrium in the heart?

  • Supplying the main pumping force
  • Protecting and holding the heart in place
  • Initiating the heart's rhythmical beat
  • Moving blood into the ventricle (correct)

Which layer of the left ventricle causes a twisting motion during systole?

  • Subendocardial (inner) layer
  • Apex layer
  • Spiral layer
  • Subepicardial (outer) layer (correct)

What is the composition of cardiac muscle fibers in the heart?

<p>Actin and myosin, typical myofibrils (D)</p> Signup and view all the answers

What is the function of the pericardium in relation to the heart?

<p>Holding the heart in place and protecting it (D)</p> Signup and view all the answers

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Study Notes

Cardiac Muscle and Heart Function

  • The cardiac muscle in the heart that exhibits automatic rhythmical electric discharge is the Pacemaker cells.

Atrium Function

  • The main function of the Atrium is to receive blood returning to the heart and act as a primer pump to send blood to the ventricles.

Ventricular Function

  • The Middle layer of the left ventricle (circumferential fibers) causes a twisting motion during systole.

Cardiac Muscle Composition

  • Cardiac muscle fibers in the heart are composed of Striated muscle fibers (having regular striations) that are involuntary (not under conscious control) and branched (allowing for rapid transmission of electrical signals).

Pericardium Function

  • The Pericardium is a sac that surrounds the heart and provides protection, reduces friction, and maintains the heart's position in the chest cavity.

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