Human Heart Anatomy and Function
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Questions and Answers

What is the equation for cardiac output (CO) in terms of stroke volume (SV) and heart rate (HR)?

  • CO = SV + HR
  • CO = SV - HR
  • CO = SV * HR (correct)
  • CO = SV / HR
  • Which condition can amplify heart murmurs?

  • Hypothermia
  • Acidosis
  • Hyperthermia
  • Deep breathing (correct)
  • How is ejection fraction (EF) calculated?

  • EF = SV - EDV + ESV
  • EF = SV + EDV - ESV
  • EF = SV / EDV (correct)
  • EF = SV * EDV
  • Which nerve releases acetylcholine to decrease heart rate?

    <p>Vagus nerve (CN X)</p> Signup and view all the answers

    What is the target heart rate range for receiving maximum aerobic exercise benefits?

    <p>120-160 BPM</p> Signup and view all the answers

    Which hormone increases heart rate in general?

    <p>Thyroid hormones</p> Signup and view all the answers

    Where is the heart located?

    <p>In the thoracic cavity between the lungs</p> Signup and view all the answers

    Which chamber of the heart receives blood from the body?

    <p>Right atrium</p> Signup and view all the answers

    What separates the heart from other structures?

    <p>Pericardium</p> Signup and view all the answers

    Which circuit of blood flow sends blood with oxygen to the body?

    <p>Systemic circuit</p> Signup and view all the answers

    Which statement about arteries is correct?

    <p>Arteries carry blood away from the heart</p> Signup and view all the answers

    What is the purpose of the fibrous pericardium?

    <p>Surrounds and protects the heart</p> Signup and view all the answers

    During the cardiac cycle, which phase involves the contraction that pumps blood?

    <p>Ventricular ejection stage</p> Signup and view all the answers

    What is the purpose of papillary muscles in the heart?

    <p>To pull the 'Heart Strings'</p> Signup and view all the answers

    Which element is NOT involved in causing the action potential (electrical current) in the heart?

    <p>Mg</p> Signup and view all the answers

    What is the lowest recorded heart rate for Miguel Indurain?

    <p>28</p> Signup and view all the answers

    Which component of an electrocardiogram hides atrial repolarization?

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

    What causes the 'Dub' sound in heart sounds during auscultation?

    <p>Opening of semilunar valves</p> Signup and view all the answers

    Where is the SA node located in the heart?

    <p>Superior and posterior aspect of right atrium</p> Signup and view all the answers

    'Lub' sound heard during cardiac auscultation is primarily associated with:

    <p>Opening of atrioventricular valves</p> Signup and view all the answers

    What does S3 represent in cardiac auscultation?

    <p>Blood flowing into the atria</p> Signup and view all the answers

    Which phase follows atrial systole during the cardiac cycle?

    <p>Isovolumic ventricular relaxation phase</p> Signup and view all the answers

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