The Immune System. Unit 1-11 Notes Mr . Hefti – Pulaski Biology. Immune System Fun Facts. Getting under 5 hours of sleep a night has been shown to greatly depress immune function. H umor has been shown to stimulate the immune system.
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Unit 1-11 Notes
Mr. Hefti – Pulaski Biology
The immune system prevents infections and detects and destroys pathogens that get into your body.
1st line of nonspecific defenses…
Skin, oil, sweat, mucus membranes…
Act as barriers blocking entry of pathogens; also make body inhospitable to them and trap them.
2nd line of defenses (specific)…
Inflammatory response:increase in blood flow brings WBCs to infection site
Fever:increase in body T kills many harmful microbes
Proteins:circulate in blood preventing infections
WBCs:patrol bloodstream attacking pathogens
The key with WBCs is to remember that there are several types of cells all working together to protect you from disease.
The Immune Response