MICROANATOMY

BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS

LYMPH NODES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Valves in lymphatic capillaries open when pressure outside the capillary is:
A
High
B
Low
C
In equilibrium with the capillary
D
None of the above
Explanation: 

Detailed explanation-1: -Fluid Pressure Regulation When pressure is greater inside the lymphatic capillary, the cells adhere more closely to each other to prevent lymph backflow. The anchoring filaments are also pulled when the tissues are swollen.

Detailed explanation-2: -As lymph capillaries collect interstitial fluid from tissues, the pressure in the lymph capillaries grows. This increasing pressure moves the lymph fluid forward toward the heart. Everywhere in your body, your lymphatic capillaries collect lymph and move it into larger lymphatic vessels.

Detailed explanation-3: -They extend out from the lymphatic capillary, attaching lymphatic endothelial cells to surrounding tissues. When excess interstitial fluid accumulates and causes tissue swelling, the anchoring filaments are pulled, making the openings between cells even larger so that more fluid can flow into the lymphatic capillary.

Detailed explanation-4: -Lymphatic Valves When the pressure of lymph fluid increase to a certain point due to filling with more lymph fluid or from smooth muscle contraction, the fluid will be pushed through the valve (opening it) into the next chamber of the vessel (called a lymphangion).

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