Cardiac Cycle and Heart Sounds Quiz
15 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What defines the four phases of the cardiac cycle?

  • P wave and QRS complex in the electrocardiogram
  • Rising and falling of the atrial pressure curve
  • Opening and closing of the cardiac valves (correct)
  • Contraction and relaxation of the heart muscles

What causes the P wave in the electrocardiogram?

  • Initiation of contraction of the ventricles
  • Spread of depolarization through the atria (correct)
  • Electrical depolarization of the ventricles
  • Spontaneous generation of an action potential in the sinus node

What initiates contraction of the ventricles in the cardiac cycle?

  • Closing of the cardiac valves
  • Rising of the atrial pressure curve
  • Electrical depolarization of the ventricles (correct)
  • Spontaneous generation of an action potential in the sinus node

Which wave in the electrocardiogram marks the onset of ventricular systole?

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

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

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

What is the period of rapid ejection during ventricular contraction called?

<p>Period of isovolumic contraction (C)</p> Signup and view all the answers

What causes the v wave in the atria?

<p>Slow flow of blood into the atria from the veins during ventricular contraction (B)</p> Signup and view all the answers

What happens during the period of isovolumic or isometric relaxation?

<p>The ventricular muscle relaxes while the volume remains constant (D)</p> Signup and view all the answers

What is the function of the A-V valves?

<p>Prevent backflow of blood from the ventricles to the atria during systole (B)</p> Signup and view all the answers

What causes the c wave in the atria?

<p>Bulging of the A-V valves backward toward the atria due to increasing pressure in the ventricles (B)</p> Signup and view all the answers

What causes the first heart sound?

<p>Rapid closure of the A-V valves at the beginning of systole (D)</p> Signup and view all the answers

Why is the second heart sound shorter in duration than the first heart sound?

<p>The semilunar valves vibrate for a shorter time than the A-V valves (D)</p> Signup and view all the answers

What is the mechanism behind the third heart sound?

<p>Oscillation of blood initiated by inrushing blood from the atria (A)</p> Signup and view all the answers

How does mitral regurgitation affect heart sounds?

<p>It causes a high-frequency blowing sound transmitted most strongly into the left atrium (D)</p> Signup and view all the answers

What condition creates a nozzle effect during systole, leading to intense vibration and a loud murmur?

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

More Like This

Mastering Heart Sounds
5 questions
Cardiac Cycle and Heart Sounds
38 questions
Cardiac Cycle and Heart Sounds
21 questions
Use Quizgecko on...
Browser
Browser