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DEFENCE MECHANISMS OF THE BODY The Function of White Blood Cells
Non-Specific Resistance Skin and Mucous Membranes Natural Killer Cells Phagocytosis Inflammation Fever
Skin and Mucous Membranes SKIN MUCOUS MEMBRANES Tightly packed cells Waterproof Hairs/cilia Mucus Sebum Sweat Tears Gastric Juice Saliva
Natural Killer Cells
Type of lymphocyte Next line of defence after skin and mucous membranes. Attack abnormal body cells
Inflammation Inflammation – the initial reaction of body tissue to infection or injury Results in area becoming painful, swollen, hot and red
Fever Raised body temperature Also known as PYREXIA Pyrogens (chemical messengers) reset the body’s thermostat Fever speeds up chemical reactions and phagocytosis
White Cell Count
Summary of Non-Specific Defence Bacteria/Virus SKIN AND MUCOUS MEMBRANES NATURAL KILLER CELLS AND PHAGOCYTOSIS (Plus Inflammation and Fever) LYMPHATIC FLUID AND/OR BLOOD
Lymphatic System Spleen
End of part one
Non-Specific Defenses April 3, Body fights disease in 2 ways 1. Non-specific defense system Protects body from all foreign substances 2. Specific.
THE BODY’S DEFENSES AGAINST INFECTION. THE BODY’S DEFENSES YOUR FIRST LINE OF DEFENSE- YOUR SKIN AND FLUIDS FORMS A BARRIER BETWEEN YOU AND PATHOGENS.
Nonspecific immune defenses The immune system protects your body from pathogens.
Lymphatic system and Immunity. Subclavian vein.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings PowerPoint ® Lecture Slide Presentation prepared by Christine L. Case M I C R.
Nonspecific immunity No specific target; treats all foreign substances the same Specific immunity Treats each microbe differently.
Lymphatic System. Root Words Pathogens Any foreign molecules that enter the body: Particles, viruses, bacteria, pollen, etc.
BELL WORK How often do you get sick? When you do get sick is it bad? Explain your answers.
Mr. Ramos The Immune System. Introduction to the Human Immune System The immune system protects the body from disease. White Blood Cells (WBC), or leukocytes,
Chapter 16 Nonspecific Defenses of the Host SusceptibilityLack of resistance to a disease Resistance Ability to ward off disease Nonspecific resistanceDefenses.
Chapter 13 Your Body Systems Lesson 6 Your Immune System.
Human Immune Response Cellular and biochemical processes that protect humans from the effects of foreign substances– usually microorganisms and their proteins.
Non-specific Immunity- “1 st Line” of Defense Nonspecific immunity- mechanisms of the body that respond to many different pathogens or invaders.
Lymphatic System The Body’s Defense System. Nonspecific Defense First Line of Defense –Skin –Mucous Membrane –Secretions.
Lymphatic and Immune System The Body’s Defense. Nonspecific Defense First Line of Defense –Skin –Mucous Membrane –Secretions.
The Immune System. Immune system Recognizes, attacks, destroys, and “remembers” each type of pathogen that enters the body Immunity is the process.
An Overview of the Body’s Defenses. The first line of defense, the skin and mucous membranes, prevents most microbes from entering the body.
Mr. Mah Living Environment Lecture 12. Give THREE examples of vectors: FliesTicks MosquitoesSquirrels RatsFleas What are the 4 types of pathogens?
Anatomy and Physiology For The First Class 2 nd Semester 1.
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