What is the primary difference between veins and arteries?
Arteries have thicker walls than veins.
Veins have no valves, while arteries have valves.
Arteries have larger lumens compared to veins.
Arteries carry blood to the heart, while veins carry blood away from the heart.
The Correct Answer is A
A. Arteries have thicker walls than veins:
Arteries have thicker walls composed of more smooth muscle and elastic tissue to withstand the high pressure of blood ejected from the heart. Veins have thinner walls and larger lumens because they operate under lower pressure and rely on valves and skeletal muscle pumps to return blood to the heart.
B. Veins have no valves, while arteries have valves:
This is incorrect because veins have valves to prevent backflow of blood, especially in the extremities. Arteries do not need valves because blood is propelled by high pressure from ventricular contraction.
C. Arteries have larger lumens compared to veins:
Veins generally have larger lumens than arteries, allowing them to act as capacitance vessels that store blood. Arteries have smaller lumens relative to their wall thickness.
D. Arteries carry blood to the heart, while veins carry blood away from the heart:
This reverses the roles. Arteries carry blood away from the heart, while veins carry blood back to the heart. Proper understanding of directionality is crucial in circulatory physiology.
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Related Questions
Correct Answer is C
Explanation
A. Epicardium:
The epicardium is the outer layer of the heart that provides protection and contains blood vessels but is not responsible for contraction.
B. Pericardium:
The pericardium is a fibrous sac surrounding the heart that provides protection and reduces friction; it does not contain muscle tissue.
C. Myocardium:
The myocardium is the thick middle layer of cardiac muscle responsible for generating the force of contraction necessary for pumping blood throughout the body. It is metabolically active and highly dependent on coronary artery perfusion.
D. Endocardium:
The endocardium lines the interior of the heart chambers and valves; it provides a smooth surface for blood flow but does not contract.
Correct Answer is A
Explanation
A. The right coronary artery supplies the inferior wall of the left ventricle:
The right coronary artery (RCA) typically supplies the inferior wall of the left ventricle, the right atrium, right ventricle, and part of the conduction system. Occlusion can lead to inferior myocardial infarction and conduction abnormalities, affecting ventricular function.
B. The circumflex artery supplies the anterior wall of the left ventricle:
The circumflex artery usually supplies the lateral and posterior walls of the left ventricle, not the anterior wall. The left anterior descending (LAD) artery supplies the anterior wall. Misidentification can affect understanding of myocardial infarction patterns.
C. The circumflex artery supplies the interventricular septum, crucial for left ventricular function:
The interventricular septum is primarily supplied by the LAD artery, not the circumflex artery. The septum is crucial for coordinated left ventricular contraction.
D. The left anterior descending artery exclusively supplies the right ventricle:
The LAD artery primarily supplies the anterior wall and interventricular septum of the left ventricle, not the right ventricle. Misunderstanding this can lead to errors in predicting areas affected during infarction.
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