Health: The Lymphatic System and Immunity Worksheet

Question 1

What is the main job of the lymphatic system?

Accepted Answer

The main job of the lymphatic system is to collect extra fluid from body tissues, return it to the bloodstream, and help the immune system fight germs.

Question 2

Lymph is a clear fluid that travels through lymph vessels. Name two things lymph may carry.

Accepted Answer

Lymph may carry extra fluid from tissues, white blood cells, fats from digestion, and waste materials. Any two of these are correct.

Question 3

Explain why lymph nodes often swell when a person has an infection.

Accepted Answer

Lymph nodes can swell during an infection because they are filtering germs and making more immune cells to help fight the infection.

Question 4

Match each lymphatic structure to its function: lymph vessels, lymph nodes, spleen, thymus. Functions: filters lymph, carries lymph, helps T cells mature, filters blood.

Accepted Answer

Lymph vessels carry lymph. Lymph nodes filter lymph. The spleen filters blood. The thymus helps T cells mature.

Question 5

What are white blood cells, and why are they important for immunity?

Accepted Answer

White blood cells are immune system cells that help protect the body from germs, harmful substances, and abnormal cells. They are important because they help find, attack, and remember invaders.

Question 6

Describe the difference between a pathogen and an antigen.

Accepted Answer

A pathogen is a germ or other organism that can cause disease. An antigen is a marker or substance that the immune system recognizes as foreign or harmful.

Question 7

A virus enters the body through the nose. Put these events in a logical order: immune cells respond, virus enters the body, symptoms may appear, body recognizes the virus as foreign.

Accepted Answer

The logical order is: virus enters the body, body recognizes the virus as foreign, immune cells respond, and symptoms may appear.

Question 8

What is the purpose of antibodies?

Accepted Answer

Antibodies are proteins made by the immune system that attach to specific antigens. They help mark germs for destruction or block germs from infecting cells.

Question 9

Explain how vaccines help the immune system prepare for future infections.

Accepted Answer

Vaccines help the immune system learn to recognize a specific pathogen or antigen without causing the full disease. This helps the body respond faster if it meets the real germ later.

Question 10

List three healthy habits that can support the immune system.

Accepted Answer

Three healthy habits that can support the immune system are getting enough sleep, eating nutritious foods, staying physically active, washing hands, managing stress, and staying up to date on recommended vaccines. Any three reasonable habits are correct.

Question 11

Why is handwashing an important way to reduce infections?

Accepted Answer

Handwashing is important because it removes many germs from the hands before they can enter the body through the mouth, nose, eyes, or breaks in the skin.

Question 12

A student says, "The lymphatic system only works when you are sick." Explain why this statement is not correct.

Accepted Answer

This statement is not correct because the lymphatic system works all the time. It constantly returns extra fluid to the blood, transports some fats, filters lymph, and helps monitor the body for germs.

Health: The Lymphatic System and Immunity

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