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What is the lymphatic system composed of?

A network of vessels that circulate body fluids.

What do the lymphatic vessels transport to the circulatory system?


What is a function of the lymphatic system?

Transport excess fluid away from interstitial spaces between cells in most tissues and return it to the blood stream, Help defend body against invasion.

What do lymphatic pathways start as?

Lymphatic capillaries that merge to form larger vessels that empty into the circulatory system.

What are lymph nodes?

Mass of lymphoid tissue

What are lymphatic capillaries?

Tiny, closed-ended tubes that extend into interstitial spaces.

What do lymphatic capillaries receive?

Tissue fluid, once reached it is called edema

How are lymphatic vessels compared to those of veins?

They are thinner

What do large lymphatic vessels pass through and merge to what?

Pass through lymph nodes and merge to form lymphatic trunks.

What do lymphatic trunks drain?

Lymph from the body

What is lymph?

Tissue fluid

What forces fluid into lymphatic capillaries?

Increasing Interstitial pressure forces

When does tissue fluid become lymph?

Tissue fluid becomes lymph once it has entered a lymphatic capillary; lymph formation depends on tissue fluid formation.

What is tissue fluid made up of?

Water and dissolved substances that leave blood capillaries by filtration and diffusion.

What drives the entry of lymph into lymphatic capillaries

Hydrostatic pressure of tissue fluid.

What propel lymph through lymphatic vessels?

Skeletal muscle contraction, breathing movements, and contraction of smooth muscle in the walls of lymphatic trunks.

What is edema?

The accumulation of excess interstitial fluid leading to swelling of tissues

Where are Lymph nodes located?

Along lymphatic pathways, which occur in chains along the parts of the larger lymphatic vessels

What is Hilum?

The indented region of a lymph node

What do lymph nodes contain?

Lymphocytes and macrophages

What are lymph nodes covered with?

Connective tissue

What are the functions of lymph nodes?

Filtering potentially harmful particles from lymph before returning it to the blood stream, and immune surveillance.

What is thymus?

Soft, bi-lobed structure enclosed in a connective tissue capsule that extends inside and divides into lobules

What do some lymphocytes mature into?

T cells

What do T cells provide?


What does the thymus secrete?

The hormone thymosin

What does thymosin influence?

Maturation of T lymphocytes once they leave the thymus

What is the largest organ of the lymphatic system?


What does the spleen filter?

Blood and removes damaged blood cells and bacteria

What is the spleen?

Resembles a large lymph node except it contains blood instead of lymph.

What is the location of the spleen?

Upper left abdominal cavity

What lies inside the spleen?

White pulp and red pulp

What does white pulp contain?


What does red pulp contain?

Red blood cells, macrophages, and lymphocytes

What is a pathogen?

Disease causing agents, can produce infections within the body

A chemical that stimulates B lymphocytes to produce antibodies?


Contains an antigen that can stimulate primary immune response against a particular diseas causing agent?


What is an allergic reaction?

An immune attack against a non- harmful substance.

What is another name for allergic reaction?

Hypersensitivity reaction

What are lymphatic vessels called?


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