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HealthPsychologyNotesTest3April22nd

Invaders dead cells cleared phagocytosis begins

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Unformatted text preview: positively or negatively positively Lecture 22 22 Stress and Illness Readings: Chapter 6 Lecture 22 23 Plan Introduction to immune system Immune system disorders Psychoneuroimmunology Stress and health Recap 24 Lecture 22 Immune System • Purpose: protect body from antigens, clear Purpose: dead cells dead • Lymphatic system – Lymph: fluid circulating through lymph vessels – Lymph nodes: capsules that clean lymph of debris Lymph and bacteria and – Lymphocytes: type of white blood cell, arise in bone Lymphocytes: marrow, some mature in thymus or spleen marrow, • • • • Lecture 22 T-cells B-cells Natural killer (NK) cells Other leukocytes (granulocytes, Other macrophages) macrophages) 25 Lecture 22 26 Nonspecific Immune System • Phagocytosis: immune cells attack antigens – Granulocytes release chemical attack – Macrophages scavenge, initiate specific response, release chemical attack of membrane • Inflammation: biochemical – – – – Enzymes destroy invaders Dead cells cleared Phagocytosis begins Damaged tissue is restored 27 Lecture 22 Specific Immune System • Cell-Mediated – Macrophage “presents” invader – T-Cell can now recognize, kill – Natural killer cells seek and destroy mutant cells • Humoral – Helper T-cell help B-cells to produce antibodies – Antibodies are proteins made for specific antigens Lecture 22 28 Lecture 22 29 Specific Immune System Response: Cell Mediated Immunity • T-cells mature in the Thymus gland – Killer T-cells (CD8) attack transplanted cells, cancerous cells, and cells already invaded by antigens – Memory T-cells remember previous invaders – Delayed-hypersensitivity T cells produce lymphokines that stimulate T...
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