Question

In mammals, lymphatic vessels possess:

• A. A series of valves that facilitate flow in one direction
• B. A pumping organ known as the lymphobursae.
• C. Immature red blood cells, which enter the blood stream after maturation.
• D. None

Answer 1

The correct option is A A series of valves that facilitate flow in one direction

Lymphatic vessels possess a series of valves that facilitate flow in one direction.

So, the correct option is 'A series of valves that facilitate flow in one direction'