Cardiovascular System Quiz
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Questions and Answers

What are the characteristics of the heart that it shares with skeletal muscle?

  • Branching fibers with similar actin and myosin arrangement (correct)
  • Cells connected by gap junctions and desmosomes
  • Separated into upper and lower chambers
  • Striated appearance and similar contraction mechanism

What is the role of calcium in skeletal muscle excitation/contraction coupling and contraction?

  • Repolarizes the muscle cell after contraction
  • Causes depolarization of the muscle cell
  • Prevents the refractory period
  • Activates the myosin-actin interaction (correct)

What separates the upper chambers of the heart?

  • Interventricular septum
  • Interatrial septum (correct)
  • Atrioventricular septum
  • Pulmonary septum

What is the daily pumping capacity of each side of the heart?

<p>300 gallons (C)</p> Signup and view all the answers

What connects the cells of the heart muscle at the intercalated disks?

<p>Gap junctions (B)</p> Signup and view all the answers

What is the role of intercalated disks in the heart?

<p>To connect cardiac muscle cells (C)</p> Signup and view all the answers

What is the main similarity between the contraction mechanism of the heart and skeletal muscle?

<p>Both have similar actin and myosin arrangement (C)</p> Signup and view all the answers

What separates the upper chambers of the heart?

<p>Interatrial septum (B)</p> Signup and view all the answers

What is the daily pumping capacity of each side of the heart?

<p>About 3000 gallons (C)</p> Signup and view all the answers

What are the characteristics of the heart that it shares with single-unit smooth muscle?

<p>Cells connected by gap junctions and desmosomes (A)</p> Signup and view all the answers

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