20 Questions
What is the formula for calculating cardiac output (CO)?
CO = SV * HR
Why does breathing deeply amplify heart murmurs?
It allows the heart to fill more before contraction
What is the normal stroke volume for a 150 lbs. individual?
70 ml
Which nerve decreases heart rate through the release of acetylcholine?
Vagus nerve
What is the difference between max cardiac output (CO) and resting CO known as?
Cardiac reserve
How does sympathetic stimulation affect heart rate?
Increases heart rate
Where is the heart located in the body?
Between the lungs in the mediastinum
What is the function of the pericardium?
It surrounds the heart and separates it from other structures
Which statement about arteries is correct?
Arteries carry blood towards the heart
What is the purpose of the pulmonary circuit?
To let the blood get oxygen
Which statement accurately describes cardiac hypertrophy?
It is often seen in aerobic athletes
What is the role of septa in the heart?
To separate the chambers of the heart
Which valves in the heart prevent backflow from arteries back into ventricles?
Semilunar valves
Where is the SA node located?
In the superior and posterior aspect of right atrium
What is the function of the AV node?
Slows down the signal to allow atria to finish contracting before ventricles contract
Which part of an electrocardiogram represents the depolarization of the ventricles?
QRS complex
What is the average end diastolic volume in the heart?
~130 ml
During which phase do semilunar valves close and atrioventricular valves remain closed?
Isovolumic ventricular relaxation phase
What are the 'Heart Strings' pulled by the papillary muscles called?
Chordae tendineae
What is the function of conducting cells in the heart?
Conduct action potential through the heart in the proper order
Test your knowledge on the anatomy and function of the human heart. Learn about the pumping mechanism, location, size variations, and more.
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