Pathogens
- Created by: Jasmin
- Created on: 02-11-13 16:34
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- Pathogens
- A microorganism that causes disease
- Viruses
- HIV --> AIDS --> immune system gradually fails
- Influenza Virus --> causes the flu
- Rhinovirus --> cause the common cold
- Bacteria
- E.Coli --> intestines, completely harmless, some strands cause food poisoning
- Vibrio Cholera --> causes cholera--> severe diarrheoa
- Mycobacterium tuberculosis --> lung disease (TB)
- Fungi
- Trichophyton rubrum --> athletes foot
- Viruses
- Entry into the body
- Gas exchange system
- Breathe in air containing pathogens
- Trapped in mucus lining the lung epithelium (outer layer of cells)
- These cells have cilia that beat and move the mucus up the trachea to the mouth where it is removed
- But some pathogens still able to reach the alveoli where they can invade cells and cause damage
- These cells have cilia that beat and move the mucus up the trachea to the mouth where it is removed
- Trapped in mucus lining the lung epithelium (outer layer of cells)
- Breathe in air containing pathogens
- The skin
- Cut in the skin, pathogens enter bloodstream
- Blood clots and dries leaving a scab to prevent pathogens entering
- Cut in the skin, pathogens enter bloodstream
- The digestive system
- Eat/drink food that contains pathogens, most killed by acidic conditions in the stomach
- But some may survive and pass into the intestines where they invade cells of the gut wall and cause disease
- Eat/drink food that contains pathogens, most killed by acidic conditions in the stomach
- Interface: a surface or boundary linking 2 systems - linking the external environment with the internal environment of the body
- Gas exchange system
- How pathogens cause disease
- Production of toxins
- Cell damage
- Break down the membranes of the host cells
- Rupture the cells to release nutrients inside them
- Breaking down the nutrients inside the cell for their own use
- This starves and eventually kills the cell
- Replicating inside the cells and bursting them when they are released
- This starves and eventually kills the cell
- Breaking down the nutrients inside the cell for their own use
- Rupture the cells to release nutrients inside them
- Break down the membranes of the host cells
- Disease: a malfunction of the body or mind which has an adverse effect on good health. It has mental, physical and social aspects
- A microorganism that causes disease
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