The Lymphatic System

The Lymphatic System

Functions of the Lymphatic System

●The lymphatic system is part of the immune system and helps destroy microorganisms that enter the body.

●The lymphatic system works closely with the circulatory system.

●Both systems move liquids through the body, and both contain white blood cells.

●There are four main functions of the lymphatic system:

-It absorbs some of the tissue fluid that collects around cells.

-It absorbs fats from the digestive system and transports them to the circulatory
system.

-It filters dead cells, viruses, bacteria, and other unneeded particles from tissue fluid and then returns the tissue fluid to the circulatory system.

-It helps fight off illness and infections and includes structures in which white blood
cells develop.

Multiple Choice

What is part of the immune system and helps destroy microorganisms that enter the body?

• Circulatory Systme

• Digestive System

• Lymphatic System

• Respiratory System

Multiple Choice

What system does the lymphatic system work closely with?

• Skeletal System

• Nervous System

• Digestive System

• Circulatory System

Multiple Choice

How many functions does the lymphatic system have?

• 4

• 1

• 3

• 2

Lymph

●Water, white blood cells, and dissolved materials such as salts and glucose
leak out of capillary walls and into the spaces that surround tissue cells.

●This fluid is called tissue fluid.

●Cells absorb the materials they need from tissue fluid and release wastes into it.

●About 90% of the tissue fluid is reabsorbed by the capillaries.

●About 10% of the tissue fluid is absorbed by the lymph vessels and is called
lymph.

Multiple Choice

What is the fluid called that leaks out of capillary walls and into the spaces that surround tissue cells called?

• Cells Fluid

• Bone Fluid

• Muscle Fluid

• Tissue Fluid

Multiple Choice

How much is reabsorbed by the capillaries?

• 40%

• 90%

• 10%

• 60%

Multiple Choice

How much is absorbed by the lymph vessels?

• 10%

• 30%

• 90%

• 70%

Multiple Choice

What is the fluid absorbed by the lymph vessels called?

• Fluids

• Liquids

• Lymph

• Water

Lymph Vessels

●The lymphatic system forms a network of lymph vessels that look similar to the circulatory system’s network of blood vessels.

●Lymph vessels absorb and transport lymph.

●The lymph is pushed through the lymph vessels by contractions of the muscles you use to move your body.

●Lymph is not pumped through the lymph vessels by the heart.

Multiple Choice

What does lymph vessels do?

• Produce lymph

• Eliminate lymph

• Absorb and Transport lymph

• Collect and Store lymph

Multiple Choice

Lymph is pumped through vessels by the heart.

• False

• True

Lymph Nodes

●Lymph vessels include clusters of small spongy structures called lymph nodes that filter particles from lymph.

●Bacteria, viruses, fungi, and pieces of dead cells are trapped and removed from the lymph as it flows through a lymph node.

●Lymph nodes also store white blood cells that attack and destroy the trapped particles.

●Large groups of lymph nodes are in the neck, the groin, and the armpits.

●When you have an infection, your body increases its production of white blood cells that fight the infection.

●Many of these white blood cells gather in your lymph nodes and cause the nodes to swell.

●The swelling disappears when the infection is gone.

Dropdown

Where are the large groups of lymph nodes located?​

Select answer

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Select answer

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Select answer

Open Ended

What happens to your lymph nodes when you get an infection? What happens to them when the infection is gone?

Bone Marrow and Thymus

●Lymphocytes are white blood cells that destroy pathogens–infections–causing microorganisms such as viruses and bacteria.

●Bone marrow is the spongy center of bones where red and white blood cells, including lymphocytes, form.

●Lymphocytes include B cells and T cells.

●B cells mature in the bone marrow, and T cells mature in the thymus gland.

●The thymus is the organ of the lymphatic system in which T cells complete their development.

●After immature T cells move from the bone marrow to the thymus, they develop the ability to recognize and destroy body cells that have been infected by
microorganisms.

●Mature B cells and T cells move into the lymph and blood to help fight infection.

Multiple Choice

How many lymphocytes are there?

• 1

• 4

• 2

• 3

Match

Match the following

• B Cells

• T Cells

• Thymus

Mature in the bone marrow.

Mature in the thymus gland.

Organ of the lymphatic system.

• Mature in the bone marrow.

• Mature in the thymus gland.

• Organ of the lymphatic system.

Spleen

●The spleen is an organ of the lymphatic system that recycles worn–out red blood cells and produces and stores lymphocytes.

●The spleen also stores blood and platelets.

●If a person is injured and loses a lot of blood, the spleen can release stored blood and platelets into the circulatory system.

Tonsils

●Your tonsils are clusters of lymph tissue on the sides of your throat.

●They help protect your body from infection by trapping and destroying bacteria and other pathogens that enter you nose and mouth.

●However, you can live without tonsils.

Open Ended

Where are your tonsils located?

Multiple Choice

Can you live without your tonsils?

• Yes

• No

Lymph Diseases and Disorders

●Damage to the lymphatic system from injury or surgery can prevent tissue fluid from draining into lymph vessels.

●As a result, tissue fluid can build up around cells and cause swelling.

●Inactivity can also cause lymph buildup and swelling.

●If the cells of your tonsils become infected, you have tonsillitis–an infection of
the tonsils.

●The uncontrolled production of white blood cells is a type of cancer called lymphoma.

●Cancer of the lymph nodes is a related disease called Hodgkin’s Lymphoma.

Open Ended

What is lymphoma?

Open Ended

Cancer of the lymph nodes is a related disease called what?

The Lymphatic System and Homeostasis

●The lymphatic system helps maintain your body’s homeostasis by regulating fluid buildup around cells.

●It supports the circulatory system by cleaning fluids and replacing them in the bloodstream.

●It also supports overall health by helping to fight infection throughout the body.