Excitation-Contraction Coupling in the Heart

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Questions and Answers

What is the primary function of calcium ions in the cardiac cycle?

  • Regulation of cardiac output
  • Initiation of muscle contraction (correct)
  • Regulation of blood pressure
  • Regulation of heart rate

What is the role of the transverse tubules in the cardiac cycle?

  • To facilitate the transmission of electrical signals (correct)
  • To regulate the contraction of cardiac muscle cells
  • To increase the surface area for gas exchange
  • To store energy for muscle contraction

During which phase of the cardiac cycle does the ventricle fill with blood?

  • Systole
  • Isovolumic contraction
  • Diastole (correct)
  • Isotonic contraction

What is the term for the amount of blood pumped by the heart per minute?

<p>Cardiac output (C)</p> Signup and view all the answers

What is the relationship between heart rate and the duration of the cardiac cycle?

<p>Heart rate increases as the duration of the cardiac cycle decreases (D)</p> Signup and view all the answers

What is the function of the atria in the cardiac cycle?

<p>To act as primer pumps (B)</p> Signup and view all the answers

What is the function of Calcium ions in Excitation-Contraction Coupling?

<p>To trigger muscle contraction through binding to troponin (A)</p> Signup and view all the answers

What is the primary function of the traverse tubules in cardiac muscle?

<p>To facilitate the transmission of action potential (A)</p> Signup and view all the answers

During the cardiac cycle, what occurs during the refractory period?

<p>The cardiac muscle is unable to respond to a new stimulus (B)</p> Signup and view all the answers

What is the main purpose of the Volume-Pressure Diagram during the cardiac cycle?

<p>To illustrate the relationship between ventricular pressure and volume (A)</p> Signup and view all the answers

What is the correct sequence of events in the cardiac cycle?

<p>Action potential, contraction, refractory period, relaxation (B)</p> Signup and view all the answers

What is the primary function of the heart as a pump?

<p>To pump blood throughout the body (A)</p> Signup and view all the answers

Which of the following is NOT a mechanism of intrinsic regulation of heart pumping?

<p>Chemical energy required for Cardiac Contraction (B)</p> Signup and view all the answers

What is the significance of the heart valves in the cardiac cycle?

<p>To prevent backflow of blood in the heart (B)</p> Signup and view all the answers

What is the primary function of the Oxygen Utilization by the Heart during cardiac contraction?

<p>To provide chemical energy for cardiac contraction (C)</p> Signup and view all the answers

What is the result of Stimulation of the Parasympathetic nerve fibers (vagus) on the heart?

<p>Decreased heart rate and contraction force (C)</p> Signup and view all the answers

What is the relationship between the heart sounds and heart pumping?

<p>Heart sounds are a result of heart pumping (D)</p> Signup and view all the answers

Which of the following is a mechanism of extrinsic regulation of heart pumping?

<p>Control of the Heart by the Sympathetic and Parasympathetic Nerves (A)</p> Signup and view all the answers

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