Lymphatic System and Immune System Review

Flashcards covering key concepts of the lymphatic system and immune responses.

What are the primary components of the lymphatic system?

Lymphatic plexuses, lymphatic vessels, lymph nodes, spleen, and tonsils.

What is the key function of the lymphatic system in relation to fluids?

It helps return excess fluid from tissues back into the bloodstream, preventing edema.

How does the lymphatic system assist in nutrient absorption?

It absorbs fat-soluble nutrients from the digestive system through specialized vessels called lacteals.

What is the main function of the immune system?

To protect the organism against invading pathogens like bacteria, parasites, and viruses.

What are the two main branches of the immune system?

Innate immunity and adaptive immunity.

What type of immune response is provided by innate immunity?

First line of defense through physical barriers, immune cells, and soluble molecules.

What are the primary lymphoid organs?

Thymus and bone marrow.

What is the role of the thymus in the immune system?

Crucial for T-cell development and maturation.

What structures are involved in the secondary lymphoid organs?

Lymph nodes and spleen.

What does the spleen do?

Filters blood, removes old or damaged red blood cells, and responds to infections.

What is Mucosa-Associated Lymphoid Tissue (MALT)?

Lymphoid tissues found in mucosal membranes that defend against pathogens entering through mucosal surfaces.

What types of T-cells coordinate the immune response?

Helper T-cells.

What are B-cells responsible for in the immune response?

Producing antibodies that neutralize pathogens or mark them for destruction.

What is lymph?

A watery fluid that moves through the lymphatic system, collecting fluids from tissues and returning them to blood.

What is the main structural unit of a lymph node?

Cortex, medulla, and paracortex.

What distinguishes the paracortex of a lymph node?

It is rich in T-cells and lacks B-cell lymphoid nodules.