Question

Choose the false statement about lymphatic vessels:

a. Lymph capillaries are more permeable than blood capillaries.
b. Lymphatic vessels have thinner walls than blood vessels.
c. Like arteries, lymphatics have no valves.
d. Lymphatic capillaries are closed-ended allowing fluids to enter but not exit.
e. Lymphatic vessels anastomose more often than veins.

Answer 1

The false statement about lymphatic vessels is that like arteries, lymphatics have no valves. In fact, lymphatic vessels have one-way valves to prevent backflow, which is contrary to the statement provided.

Step-by-step explanation:

Among the statements about lymphatic vessels, the false one is c. Like arteries, lymphatics have no valves. Unlike arteries, lymphatic vessels do have one-way valves, which prevent the backflow of lymph fluid within the system. These valves help to ensure that the lymph moves in a single direction towards the heart.

Lymphatic capillaries are highly permeable structures formed by overlapping endothelial cells that allow interstitial fluids to enter but prevent them from exiting, which means that statement d is correct. Also, lymphatic capillaries are closed-ended (statement d) and they do anastomose, or join together, more often than veins, making statement e true as well.