Лимфатическая система

What is the main purpose of the lymphatic system?

• To remove excess fluid from body tissues and return it to the bloodstream.

• To transport oxygen to the body's cells.

• To produce hormones.

• To digest food.

How does the lymphatic system prevent swelling in body tissues?

• By picking up the excess fluid that is not reabsorbed back into the bloodstream.

• By increasing blood flow.

• By producing more lymphocytes.

• By filtering out toxins.

How do lymphatic capillaries differ from blood capillaries?

• Their gaps are larger, allowing for the entry of bacteria, immune cells, and other large particles.

• They are smaller in diameter.

• They do not have valves.

• They are more numerous.

Why are lymphatic capillaries able to allow large particles like bacteria and immune cells to enter?

• Because their overlapping flaps function as one-way valves, opening when interstitial pressure increases.

• Because they are larger in size.

• Because they are more permeable.

• Because they have no walls.

What role do lymph nodes play in the lymphatic system?

• They serve as filters in the lymphatic system, cleansing the fluid before it reaches the bloodstream.

• They produce lymphocytes.

• They store excess fluid.

• They transport nutrients.

What types of cells are found in lymph nodes, and what is their function?

• Macrophages, dendritic cells, T-cells, and B-cells, which work together to identify and destroy pathogens while producing antibodies specific to the invading pathogen.

• Only T-cells.

• Only B-cells.

• Only macrophages.

What are the primary and secondary lymphoid organs, and what functions do they serve in the lymphatic system?

• The primary lymphoid organs, such as the thymus and bone marrow, are sites of lymphocyte production, maturation, and selection. Secondary lymphoid organs, like lymph nodes, spleen, and lymphoid nodules, are where mature lymphocytes encounter pathogens and become activated.

• Only primary lymphoid organs are involved.

• Only secondary lymphoid organs are involved.

• They have no specific functions.

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What is this?

What is this?