OVERVIEW OF THE IMMUNE SYSTEM
LYMPHATIC TISSUES AND ORGANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gravity
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A lymphatic heart
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Ropes and pulleys
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Motivation
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Detailed explanation-1: -There is no pump in the lymphatic system like the heart in the cardiovascular system. The pressure gradients to move lymph through the vessels come from the skeletal muscle action, respiratory movement, and contraction of smooth muscle in vessel walls.
Detailed explanation-2: -Segments of lymph capillaries are divided by one-way valves and a spiral set of smooth muscles called lymphangions. This system moves fluid against gravity in a peristalsis-type undulation. The lymphatic tubes merge into one another until major channels and vessels are formed.
Detailed explanation-3: -After it is cleaned, the lymph returns to the heart by the action of smooth muscle pumping, skeletal muscle action, and one-way valves joining the returning blood near the junction of the venae cavae entering the right atrium of the heart.