Question

multiple select question
select all that apply
choose all that are features of lymphatic vessels.

• they resist moderate to high pressure
• smooth muscle is present in the vessel wall
• valves are present
• they have thick walls
• a tunica interna is present

Explanation:

1. Analyze each option:

• "They resist moderate to high pressure": Lymphatic vessels have low pressure, so this is incorrect.
• "Smooth muscle is present in the vessel wall": Larger lymphatic vessels have smooth muscle in their walls, so this is correct.
• "Valves are present": Lymphatic vessels have valves to prevent backflow, so this is correct.
• "They have thick walls": Lymphatic vessels have thin walls compared to blood vessels like arteries, so this is incorrect.
• "A tunica interna is present": Lymphatic vessels have a tunica interna (endothelium - lined), so this is correct.

Answer:

B. Smooth muscle is present in the vessel wall, C. Valves are present, E. A tunica interna is present