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Immune System Introduction

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Questions and Answers

What is the primary function of the immune system?

To facilitate digestion

To produce hormones

To guard against disease and tissue damage (correct)

To regulate body temperature

Which of the following is NOT a function of the immune system?

Defense against microorganisms

Surveillance of abnormal body cells

Removal of damaged tissue

Production of hormones (correct)

Where are immune cells highly concentrated in the body?

Brain and spinal cord

Skin and hair

Blood and lymphatic tissue (correct)

Muscles and bones

What is the name of the organ where immune cells mature?

Thymus Signup and view all the answers

What is the term for the process by which the immune system identifies and destroys abnormal body cells?

Surveillance Signup and view all the answers

Which of the following is NOT a component of the immune system?

Kidney Signup and view all the answers

What is the primary function of the lymph nodes?

To filter lymph and remove debris Signup and view all the answers

What is the main function of the spleen?

To filter the blood and remove worn out cells Signup and view all the answers

What is the percentage of white blood cells in total blood volume?

Less than 1% Signup and view all the answers

What is the function of the thymus?

To produce T-lymphocytes Signup and view all the answers

What is the primary function of neutrophils?

To remove debris Signup and view all the answers

What is the role of macrophages in the immune system?

To remove debris Signup and view all the answers

What is the role of lymphatic vessels?

To carry lymph from tissues to lymph nodes Signup and view all the answers

What is the function of MALT?

To provide immune response and remove debris Signup and view all the answers

Study Notes

Immune System Introduction

The Immune System helps to guard against disease and tissue damage.
Immune cells are distributed throughout the body, but are highly concentrated in blood and lymphatic tissue.

Functions of the Immune System

Defense: protects against invading microorganisms.
Clean up: removes damaged tissue.
Surveillance: identifies and destroys abnormal body cells.

Lymphoid Tissue

Bone Marrow: site of white blood cell production.
Lymphatic Vessels: carry lymph from tissues to lymph nodes and lymph organs before returning to blood.
Lymph Nodes, Tonsils, MALT, Appendix: collections of lymphocytes for immune response and macrophages to remove debris.
Spleen: replaces worn out blood cells, collections of lymphocytes for immune response and macrophages to remove debris.
Thymus: site of T-lymphocyte (T-cell) maturation.

White Blood Cells (Leukocytes)

Make up less than 1% of total blood volume.
General Functions: major cells of the Immune System's internal defense against foreign cells, remove debris, destroy cancer cells.
5 types:
- Neutrophils
- Lymphocytes
- Monocytes
- Eosinophils