Causes Of Disease

Causes Of Disease

Pathogens

• Microorganisms that cause disease.
• Penetrate organism's interfaces with the environment.
• Damage host tissues-break down membranes of host cells.
• Producing toxins-leads to excessive water loss from the lining of the intestine.

Infection

• A pathogen gets into the host and colonises its tissue.

Disease

• A malfunction of body or mind which has an adverse effect on good health.
• Occurs when an infection leads to regonisable symptoms.

Transmission

• When a pathogen is transferred from one individual to another.

Interface

• A surface or boundary linking two systems.
• Gas exchange system.
• Digestive system.

Natural Defenses

• Mucous layer that covers exchange surfaces & forms a…