Lymphatic System and Immunity Madie McKenzie

It is basically a second “irrigation system” within the human body. It includes several structures including:

Lymph fluid

Lymph nodes, vessels, capillaries




Basic functions are fluid balance, fat absorption, and defense

Fluid balance: Ions, nutrients, gases, proteins, hormones, enzymes, waste products

Fat absorption: Absorbs fats from digestive tract

Defense: filters microorganisms and foreign substance (lymph nodes filter lymph nodes filter lymph and spleen filters blood)

Lymphatic Movement:

Major locations and lymph pathways-

Lymphatic Capillaries

• Closed-ended tubes

• Parallel blood capillary

Lymph movement

• 1. Hydrostatic pressure

• 2. Muscular contractions

lymph nodes: filter harmful particles that are throughout the body

Lymph: a colorless fluid containing white blood cells, that bathes the tissues and drains through the lymphatic system into the bloodstream.

Lymph is formed when interstitial fluid comes into contact with blood. Initially, it is a watery liquid with the same consistency as interstitial fluid which thickens as it accumulates additional material from blood, such as proteins and lymphocytes

Lymph nodes: each of a number of small swellings in the lymphatic system where lymph is filtered and lymphocytes are formed.. Lymph nodes filter all the gross stuff out and keeps us healthy

Thymus: a lymphoid organ situated in the neck of vertebrates that produces T cells for the immune system

The thymus serves a vital role in the training and development of T-lymphocytes or T cells, an extremely important type of white blood cell.

Spleen: an abdominal organ involved in the production and removal of blood cells in most vertebrates and forming part of the immune system.

The spleen acts as a filter for blood as part of the immune system.

The bodies defenses against infection:

Innate defenses- are the bodies first responders. This includes fevers, inflammation, specific resistance, skin/ mucus membranes, enzyme actions, mechanical and chemical barriers, interferons, natural killer cells, and phagocytes

adaptive defenses- the back up plan. These come into play when the pathogens get past the first set of boundaries. These are the heavy duty stuff, which are activated days after pathogen first enters the body

Created By
Madie McKenzie


Created with images by Kalyber - "Figure 36 Lymphatic System" • shaire productions - "Gray Background with Subtle Cracks" • perpetualplum - "page 127 Lymph Vessels of the Head" • Ephemeral Scraps - "Tubercular spleen of cattle"

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