When comparing the flow of lymph in the lymphatic system with the flow of blood in the circulatory
system, it can be said that the lymphatic system also
A. contains fluid that travels in a closed circuit.
B. uses a pump.
C. contains fluid that travels in only one direction.
D. uses valves to prevent backward flow
To get the answer to this question, we can start by understanding the flow of lymph in the lymphatic system and the flow of blood in the circulatory system.
In the circulatory system, blood flows in a closed circuit. The heart serves as the pump that propels the blood throughout the body. The blood travels through arteries, which carry oxygen-rich blood away from the heart to the body, and then through veins, which carry oxygen-depleted blood back to the heart.
Now, let's consider the lymphatic system. The lymphatic system is a network of lymphatic vessels that collect a fluid called lymph from the body tissues. Lymph is made up of fluids, proteins, waste products, and immune cells. Unlike blood, the lymphatic system does not have a central pump like the heart.
So, let's analyze the options:
A. Contains fluid that travels in a closed circuit: The lymphatic system does not have a closed circuit like the circulatory system. The lymph flows in a one-way direction from the tissues to the bloodstream.
B. Uses a pump: As mentioned earlier, the lymphatic system does not have a centralized pump. Instead, the movement of lymph is facilitated by the contraction of skeletal muscles and breathing movements.
C. Contains fluid that travels in only one direction: This statement is true. The lymphatic vessels have valves that allow the lymph to flow in only one direction, preventing any backflow.
D. Uses valves to prevent backward flow: This statement is also true. The lymphatic vessels have one-way valves, which ensure that the lymph flows in the desired direction and prevents it from flowing backward.
Therefore, the correct answer is D. The lymphatic system uses valves to prevent backward flow, similar to the circulatory system.