Which of the following valves separates the atrial and ventricular chambers of the heart?
Pulmonary
Atrioventricular
Semilunar
Aortic
The Correct Answer is B
a. Pulmonary: The pulmonary valve separates the right ventricle from the pulmonary artery, which carries blood to the lungs.
b. Atrioventricular: The heart has four chambers: two upper atria and two lower ventricles. The atrioventricular valves (AV valves), also known as tricuspid and mitral valves, separate the atria from the ventricles and prevent blood from flowing backward from the ventricles to the atria.
c. Semilunar: Semilunar valves (aortic and pulmonary) are located at the base of the aorta and pulmonary artery, preventing blood from flowing back into the ventricles.
d. Aortic: The aortic valve separates the left ventricle from the aorta, the main artery carrying blood away from the heart to the body.
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Related Questions
Correct Answer is C
Explanation
a. Outermost layer that lies underneath the pericardial sac: This describes the epicardium, not the endocardium.
b. Outer layer that produces serous fluid: This describes the pericardium, particularly the visceral layer.
c. Inner layer that is continuous with the blood vessels: The endocardium is the innermost layer of the heart, lining the heart chambers and continuous with the endothelium of blood vessels.
d. Central layer that contracts and relaxes: This describes the myocardium, the muscular middle layer of the heart
Correct Answer is B
Explanation
a. Aortic: This valve has three cusps and is open during systole to allow blood flow from the left ventricle into the aorta.
b. Mitral: This valve, also known as the bicuspid valve, has two leaflets and closes during systole to prevent backflow of blood into the left atrium.
c. Pulmonic: This valve has three cusps and is open during systole to allow blood flow from the right ventricle into the pulmonary artery.
d. Tricuspid: This valve has three leaflets and closes during systole to prevent backflow of blood into the right atrium.
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