Human Heart Function and Anatomy Quiz

What is the term used when both S3 and S4 heart sounds are heard?

S7

How is a murmur graded?

On a scale from 1-6

What is the formula for calculating cardiac output?

CO = SV x HR

What does the ejection fraction represent?

The ratio of stroke volume to end diastolic volume Signup and view all the answers

What is the term for the difference between maximum cardiac output and resting cardiac output?

Cardiac reserve Signup and view all the answers

How do sympathetic and parasympathetic nervous systems affect heart rate?

Sympathetic increases heart rate, while parasympathetic decreases heart rate Signup and view all the answers

What is the function of the atrioventricular valves in the heart?

Prevent backflow from ventricles back into atria Signup and view all the answers

Which chamber of the heart receives blood continuously from the pulmonary circuit?

Left Atrium Signup and view all the answers

In what phase of the cardiac cycle do the atrioventricular valves open prior to atria contraction?

Isovolumic ventricular relaxation phase Signup and view all the answers

Which element is responsible for causing the action potential (electrical current) in cardiac muscle?

Na, Ca, and K Signup and view all the answers

Where is the SA node located in the heart?

Superior and posterior aspect of right atrium Signup and view all the answers

What is the main function of conducting cells in the heart?

Allow the action potential to move through the heart in the proper order Signup and view all the answers

Which structure is responsible for hiding atrial repolarization in an electrocardiogram (EKG)?

QRS complex Signup and view all the answers

During which phase of the cardiac cycle does atrial systole occur?

Atrial systole lasts about 100 ms Signup and view all the answers

What is the name for the amount of blood that left the heart during a contraction?

Stroke volume Signup and view all the answers

What causes the 'Lub' sound in a heart auscultation?

Closing of atrioventricular valves Signup and view all the answers

Where is the heart located in the body?

Between the lungs in the thoracic cavity Signup and view all the answers

Which chamber of the heart expels blood to the body?

Right ventricle Signup and view all the answers

What is the function of the pulmonary circuit?

To allow blood to get oxygen in the lungs Signup and view all the answers