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

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

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

Which hormone increases heart rate in general?

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

Where is the heart located?

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

Which chamber of the heart receives blood from the body?

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

What separates the heart from other structures?

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

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

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

Which statement about arteries is correct?

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

What is the purpose of the fibrous pericardium?

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

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

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

What is the purpose of papillary muscles in the heart?

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

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

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

What is the lowest recorded heart rate for Miguel Indurain?

<p>28 (B)</p> Signup and view all the answers

Which component of an electrocardiogram hides atrial repolarization?

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

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

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

Where is the SA node located in the heart?

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

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

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

What does S3 represent in cardiac auscultation?

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

Which phase follows atrial systole during the cardiac cycle?

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

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