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BPK 140 (138)
Chapter 9

Chapter 9

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Simon Fraser University
Biomedical Physio & Kines
BPK 140
Diana Bedoya

KIN 140 Book Notes An Invitation to Health Reading List 2 Chapter 9; pp. 228-253 PATHOGENS OR AGENTS OF INFECTION - Viruses – small infectious organisms; smaller than bacteria o Cannot live without a host; must invade an animal or plant cell to reproduce o May or may not have envelope – outermost spiky layer o Some viruses do not kill the host cell, but instead alter its function o Usually viruses only infect a certain type of cell o Antiviral drugs – don’t completely eradicate the viral infection, but can decrease its severity and duration o Most common viruses  Filovirus  Hepatitis virus – cause several forms of liver infection  Herpes virus – take up permanent residence in cells and periodically flare up  Influenza virus – causes the flu; can change outer protein coats so that individuals restraint to one strain cannot fight off a new one  Norovirus – causes gastroenteritis in people  Papillomavirus – may be responsible for cervical cancer in younger women  Retrovirus – named for their backward sequence of genetic replication compared to other viruses • HIV and AIDS  Rhinovirus and adenovirus – cause upper respiratory tract infections and colds  Slow viruses – give no early indication off their presence but can produce fatal illness within a few years - Bacteria—one-celled organism o Has a rigid cell wall that surrounds the cytoplasm in the cell o Has DNA o Most kinds of bacteria don’t cause disease o Harmful bacteria release either enzymes that digest body cells or toxins that produce the specific effects of such diseases o Antibiotics – drugs that inhibit or kill bacteria - Fungi – eukaryotic organisms that come in a variety of shapes and sizes o Yeast – single celled o Molds or mushrooms – long chain of cells that can stretch for miles o Are static, but can spread by reproductive spores or by growing threadlike fibers o They absorb nutrients from organic material o Antifungal drugs - Protozoa – single-celled
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