Cardiovascular System and Blood Circulation Quiz
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Questions and Answers

Which blood vessels carry oxygenated blood away from the heart?

  • Arteries (correct)
  • Veins
  • Capillaries
  • Ventricles

What is the thickest layer of cardiac muscle in the heart wall?

  • Endocardium
  • Myocardium (correct)
  • Epicardium
  • Pericardium

Which valves ensure one-way flow of blood from the atria to the ventricles?

  • Aortic semilunar valve
  • Atrioventricular valves (AVs) (correct)
  • Semilunar valves
  • Pulmonic semilunar valve

Where is the area known as mediastinum located?

<p>Between the lungs and the diaphragm (D)</p> Signup and view all the answers

What are the chambers of the heart that receive blood from veins?

<p>Atria (D)</p> Signup and view all the answers

Where does the exchange of fluids between the blood and interstitial space primarily occur?

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

What is the main function of the sinoatrial (SA) node?

<p>To set the rhythm of the heart between 61-100 bpm (D)</p> Signup and view all the answers

What does ventricular fibrillation (V-fib) cause?

<p>A deadly heart quiver, making the heart quiver instead of pump blood (C)</p> Signup and view all the answers

What is the main purpose of an electrocardiogram (EKG)?

<p>To assess the electrical conduction system of the heart (B)</p> Signup and view all the answers

What is the function of the purkinje fibers in the heart?

<p>To increase electrical conductivity and strength of myocardial contraction (C)</p> Signup and view all the answers

What is the primary role of the sympathetic nerves in controlling the heart?

<p>To increase electrical conductivity and strength of myocardial contraction (B)</p> Signup and view all the answers

What does atrial flutter represent?

<p>A type of heart rhythm disorder caused by problems in the heart's electrical system (C)</p> Signup and view all the answers

What is the primary function of ventricular tachycardia (V-tach)?

<p>A type of heart rhythm problem caused by irregular electrical signals in the lower chambers of the heart (ventricles) (D)</p> Signup and view all the answers

What does an action potential cause in the heart?

<p>An explosion of electrical activity that leads to contraction (systole) (D)</p> Signup and view all the answers

What is the function of the left bundle branch in the electrical conduction system?

<p>To quickly transmit electrical signals to cells of ventricles (D)</p> Signup and view all the answers

What component of an EKG represents atrial depolarization?

<p>P wave (B)</p> Signup and view all the answers

What is preload in terms of hemodynamics?

<p>Amount of blood returning to right side of the heart (A)</p> Signup and view all the answers

What is the primary function of the atria in the heart?

<p>To send blood to the ventricles (B)</p> Signup and view all the answers

Which component of the heart is responsible for the one-way flow of blood from the atria to the ventricles?

<p>Tricuspid valve (B)</p> Signup and view all the answers

Where does the exchange of fluids between the blood and interstitial space primarily occur in the cardiovascular system?

<p>Capillaries (D)</p> Signup and view all the answers

What is the primary purpose of the pericardial space in the heart?

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

Which layer of the heart wall is responsible for contracting and pumping blood throughout the body?

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

What is the function of semilunar valves in the heart?

<p>To prevent backflow of blood into the ventricles (D)</p> Signup and view all the answers

What is the main function of the atrioventricular node (AV) in the electrical conduction system of the heart?

<p>Slows down the electrical impulse, allowing the atria to contract before the ventricles (D)</p> Signup and view all the answers

Which component of an EKG represents ventricular depolarization?

<p>QRS complex (C)</p> Signup and view all the answers

What is the primary role of the purkinje fibers in the electrical conduction system of the heart?

<p>Distribute the electrical impulse to the ventricles for coordinated contraction (B)</p> Signup and view all the answers

What does ventricular tachycardia (V-tach) represent in terms of heart rhythm?

<p>Rapid and irregular heartbeat originating in the ventricles (D)</p> Signup and view all the answers

What is the main function of the sympathetic nerves in controlling the heart?

<p>Increase electrical conductivity and strength of myocardial contraction (B)</p> Signup and view all the answers

Which part of the heart's electrical conduction system sets the rhythm of the heart between 61-100 beats per minute?

<p>Sinoatrial node (SA) (C)</p> Signup and view all the answers

What does atrial flutter represent in terms of heart rhythm?

<p>Regular, rapid heartbeat originating in the atria (A)</p> Signup and view all the answers

What is the primary function of ventricular fibrillation (V-fib) in the heart?

<p>Makes your heart quiver instead of pump blood, potentially leading to sudden cardiac arrest (A)</p> Signup and view all the answers

Which component of an EKG represents atrial depolarization?

<p>P wave (D)</p> Signup and view all the answers

What is preload in terms of hemodynamics?

<p>Amount of blood returning to the right side of the heart (A)</p> Signup and view all the answers

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