Anatomy: Veins Characteristics and Blood Distribution

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What initiates the S1 sound in the heart?

Closure of AV valves (correct)

Opening of semilunar valves

Blood flow from ventricles to atria

Increase in ventricular pressure

What characterizes isovolumetric contraction in the heart?

AV valves open

Volume remains constant in ventricles (correct)

Pressure drop in ventricles

Semilunar valves open

At what pressure do the semilunar valves open in the left ventricle?

100-110 mmHg

15-20 mmHg

40-50 mmHg

80-90 mmHg (correct)

What is the name for the volume of blood ejected from the ventricle in one heart beat?

Stroke volume Signup and view all the answers

What event leads to the 'S2 dub' sound in the heart?

Semilunar valves closure Signup and view all the answers

During which phase of the cardiac cycle does atrial depolarization begin?

P wave Signup and view all the answers

What occurs during ventricular diastole?

Gradual filling of the ventricles Signup and view all the answers

Where is the end diastolic volume typically found?

Ventricles Signup and view all the answers

What initiates ventricular repolarization during a cardiac cycle?

T wave Signup and view all the answers

Where are the semilunar valves located in the heart?

At the entrance to the aorta and pulmonary artery Signup and view all the answers

What is the primary function of the atrioventricular (AV) valves in the heart?

Prevent blood from flowing back into the atria when ventricles contract Signup and view all the answers

What initiates the opening and closing of heart valves during the cardiac cycle?

Changes in blood pressure inside the heart chambers Signup and view all the answers

Why do semilunar valves close when ventricles relax?

To prevent blood from flowing back into the ventricles Signup and view all the answers

What happens if the AV valves become incompetent in a healthy heart?

Blood will flow back into the atria when ventricles contract Signup and view all the answers

What causes the AV valve to slam shut into the atria during the shutting process?

Pressure in the ventricle greater than pressure in the atria Signup and view all the answers

Where does blood flow after leaving the right ventricle through the pulmonary valve?

Pulmonary arteries Signup and view all the answers

What triggers the opening of the semilunar valves in the heart?

Pressure in the aorta is higher than pressure in the ventricles Signup and view all the answers

What purpose do the valves in the heart serve?

Ensure one-way blood flow Signup and view all the answers

What is the location of the atrioventricular sulcus in the heart?

Separates atria and ventricles Signup and view all the answers