The Cardiovascular System: The Heart Chapter 19 - Heart Anatomy
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Questions and Answers

What is the volume of fluid that the heart pumps per minute?

  • 5.25 L (correct)
  • 8 L
  • 1 L
  • 3 L

Where is the heart located?

  • Between the kidneys
  • Behind the liver
  • In the abdominal cavity
  • In a space called mediastinum (correct)

Which chamber of the heart connects to the pulmonary trunk?

  • Right atrium
  • Left ventricle
  • Right ventricle (correct)
  • Left atrium

What is the function of the atria in the heart?

<p>Collect blood and push it into lower chambers (C)</p> Signup and view all the answers

Which layer of the heart is described as the 'middle thickest layer'?

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

Which of the following vessels is the only artery to carry deoxygenated blood?

<p>Pulmonary artery (A)</p> Signup and view all the answers

What happens at 0mV in terms of ion channels?

<p>Ca++ channels close and K+ channels open (A)</p> Signup and view all the answers

What is the role of Ca++ in muscle contraction?

<p>Ca++ binds to troponin to allow myosin and actin cross bridge (A)</p> Signup and view all the answers

At what rate would the AV node fire if not for endocrine control?

<p>40 - 60 times per minute (D)</p> Signup and view all the answers

What is the function of an Artificial Pacemaker?

<p>Deliver electrical impulses for effective heart contractions (A)</p> Signup and view all the answers

Which part of the ECG represents the repolarization of the ventricles?

<p>T wave (A)</p> Signup and view all the answers

What is the purpose of Abbreviated ECG or EKG with 12 leads?

<p>To monitor electrical signals of the heart more comprehensively (C)</p> Signup and view all the answers

What is the function of endothelins released by the endothelium?

<p>Regulating growth patterns of cardiac muscle cells (C)</p> Signup and view all the answers

Which valves separate the atria from the ventricles?

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

What is the function of the moderator band?

<p>Assists in cardiac conduction (D)</p> Signup and view all the answers

What is the purpose of the fossa ovalis?

<p>Allow blood flow during fetal circulation (B)</p> Signup and view all the answers

Which of the following statements is true about coronary circulation?

<p>Arteries branch off the aorta near the ventricles. (C)</p> Signup and view all the answers

What is the primary function of myocardial conducting cells?

<p>Initiate and propagate action potentials through the heart (D)</p> Signup and view all the answers

Where are T tubules found in cardiac muscle cells?

<p>At Z discs (D)</p> Signup and view all the answers

What is the role of desmosomes in cardiac muscle cells?

<p>Prevent cardiac muscle cells from separating (D)</p> Signup and view all the answers

What is the function of Purkinje fibers in the heart?

<p>Conduct impulses throughout the ventricles (C)</p> Signup and view all the answers

What occurs during the plateau phase in cardiac contractile cells?

<p>Sarcoplasmic reticulum releases Ca++ (A)</p> Signup and view all the answers

What is the main function of the Bundle of His?

<p>Impulse conduction to ventricles (D)</p> Signup and view all the answers

What is an essential role of gap junctions in cardiac muscle?

<p>Ion exchange between cells (A)</p> Signup and view all the answers

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