Question

question 10 (0.5 points)
you are given a histological slide of the cross - section of a blood vessel that carries oxygenated blood. under the microscope, you observe the following features:

• single layer of endothelial cells lining the lumen
• tunica media with 1 - 2 layers of smooth muscle
• no visible internal or external elastic lamina

based on these characteristics, what type of vessel are you most likely observing?
○ arteriole
○ artery
○ capillary
○ vein

Explanation:

To determine the blood vessel type, we analyze each option:

• Arteriole: Has a single endothelial layer, tunica media with 1 - 2 smooth muscle layers, and no visible elastic lamina (matches the observed features).
• Artery: Has thicker tunica media (more smooth muscle layers) and visible elastic lamina (does not match).
• Capillary: Consists of only endothelial cells (no tunica media with smooth muscle, so does not match).
• Vein: Has thinner tunica media, often with valves, and different structural features (does not match).

Answer:

A. Arteriole