Lymphatic System Lecture Notes

Flashcards about the Lymphatic System

Lymphatic System

Absorbs excess interstitial fluid and returns it to the bloodstream.

Lacteals

Absorb dietary fats in the lymphatic system.

Lymphocytes

Production, maintenance, and distribution of these cells are key functions of the lymphatic system in the body, aiding in defense against pathogens.

Lymph

The fluid carried by lymphatic vessels.

Lymphatic Capillaries

Begin as blind-ended vessels in the tissues.

Thoracic Duct

One of the two main lymphatic ducts.

Right Lymphatic Duct

The other of the two main lymphatic ducts.

Lymph Nodes

Found along lymphatic vessels and filter lymph; contain macrophages and lymphocytes.

Macrophages

Engulf pathogens and debris within lymph nodes.

Primary Lymphatic Organs

Include the red bone marrow and thymus.

Secondary Lymphatic Organs

Include lymph nodes, spleen, and tonsils.

Innate Immune Defenses

Fully functional without previous exposure to a pathogen; includes skin, inflammation, and protective proteins.

Adaptive Immune Defenses

Initiated when exposed to a pathogen; comes into play when innate defenses fail; involves B & T lymphocytes.

Antibody

Y-shaped proteins produced by B lymphocytes that bind to antigens to neutralize them.

Antigen-binding Site

The location on an antibody where an antigen fits and binds.

Active Immunity

The body makes antibodies against a particular antigen through natural infection or immunization.

Passive Immunity

Getting antibodies to combat a disease; temporary immunity, such as from mother to newborn.

Allergies

Hypersensitivity to allergens.

Anaphylactic Shock

An immediate allergic response; a sudden and life-threatening drop in blood pressure.

Epinephrine

Counteracts anaphylactic shock.

Autoimmune Disease

The immune system attacks the body's own cells; involves both genetic and environmental factors.