DEFENCE MECHANISMS OF THE BODY The Function of White Blood Cells.

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Presentation transcript:

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

Phagocytosis

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

Lymphatic Tissue

End of part one

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