Human Heart Anatomy and Function

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What is the formula for cardiac output?

End systolic volume - end diastolic volume
End diastolic volume - end systolic volume
Heart rate / stroke volume
Stroke volume * heart rate (correct)

How do deep breaths affect heart murmurs?

Deep breaths change the frequency of heart murmurs
Deep breaths have no effect on heart murmurs
Deep breaths reduce the intensity of heart murmurs
Deep breaths amplify heart murmurs (correct)

What is the normal stroke volume for a 150 lbs. individual?

120 ml
50 ml
70 ml (correct)
100 ml

What is ejection fraction?

(End diastolic volume - end systolic volume) / end diastolic volume (D) Signup and view all the answers

How does sympathetic stimulation affect heart rate?

Increases heart rate (D) Signup and view all the answers

What is the role of the medulla oblongata in controlling heart rate?

Increases heart rate through the cardiac accelerator nerves (A) Signup and view all the answers

Where is the heart located in the human body?

Between the lungs in the thoracic cavity (C) Signup and view all the answers

Which statement about atria and ventricles is correct?

Atria receive blood while ventricles expel blood (C) Signup and view all the answers

What is the function of the pulmonary circuit?

To let blood get oxygen (A) Signup and view all the answers

Which layer surrounds the heart and is also the innermost layer of pericardium?

Epicardium (visceral layer of serous pericardium) (D) Signup and view all the answers

What is the role of veins in the cardiovascular system?

Carry blood back to the heart (A) Signup and view all the answers

Which statement about arteries is true?

Pulmonary arteries carry oxygenated blood (B) Signup and view all the answers

What prevents backflow from arteries back into ventricles in the heart?

Semilunar valves (C) Signup and view all the answers

Which component in the heart contracts to prevent backflow by pulling the 'Heart Strings'?

Papillary muscles (B) Signup and view all the answers

Where is the SA node located in the heart?

Right atrium (C) Signup and view all the answers

What is the function of conducting cells in the heart?

Allow action potential to move through the heart (A) Signup and view all the answers

Which element causes the action potential (electrical current) in the heart?

Na, Ca, K (C) Signup and view all the answers

What does the T wave represent in an electrocardiogram (EKG)?

Repolarization of ventricles (D) Signup and view all the answers

What is the significance of the end diastolic volume in the heart?

Amount of blood that can be pumped out (D) Signup and view all the answers

'Lub' sound heard through a stethoscope is associated with which event in the heart cycle?

Closing of atrioventricular valves (A) Signup and view all the answers

'Dub' sound heard through a stethoscope is associated with which event in the heart cycle?

Opening of semilunar valves (D) Signup and view all the answers

Which chamber is the last one blood moves through before being ejected into the systemic circuit?

Left ventricle (A) Signup and view all the answers