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Pathway of Blood Through the Heart and Lungs

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Pathway of Blood Through the Heart and Lungs

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Questions and Answers

What is the purpose of the atrioventricular valves?

To direct blood flow into the systemic circulation

To prevent backflow into the aorta

To regulate blood flow into the lungs

To prevent backflow into the atria (correct)

Which valve lies between the left ventricle and the aorta?

Tricuspid valve

Bicuspid valve

Aortic semilunar valve (correct)

Pulmonary semilunar valve

What is the function of the collateral routes in the coronary circulation?

To pump blood from the heart to the aorta

To supply blood to the lungs

To ensure blood delivery to the heart even if major vessels are occluded (correct)

To regulate blood flow to the systemic circulation

What is the purpose of the chordae tendineae?

<p>To anchor the atrioventricular valves to the papillary muscles</p> Signup and view all the answers

What is the direction of blood flow through the heart and lungs?

<p>Right atrium → tricuspid valve → right ventricle → lungs</p> Signup and view all the answers

Study Notes

Blood Flow Through the Heart

Right atrium → tricuspid valve → right ventricle
Right ventricle → pulmonary semilunar valve → pulmonary arteries → lungs
Lungs → pulmonary veins → left atrium
Left atrium → bicuspid valve → left ventricle
Left ventricle → aortic semilunar valve → aorta
Aorta → systemic circulation

Heart Valves

Ensure unidirectional blood flow through the heart
Atrioventricular (AV) valves:
- Lie between atria and ventricles
- Prevent backflow into atria when ventricles contract
- Anchored to papillary muscles by chordae tendineae
Semilunar valves:
- Aortic semilunar valve: between left ventricle and aorta
- Pulmonary semilunar valve: between right ventricle and pulmonary trunk
- Prevent backflow of blood into ventricles