Resistance to Antibiotics: An Outline Within a bacterial population, there is variation caused by mutations (as occurs in populations of all species) A chance mutation might cause some bacteria to ...
Penicillin: Why it Affects Bacteria & Not Viruses Antibiotics are drugs that kill or stop the growth of bacteria (prokaryotes) but do not harm the cells of the infected organism Some antibiotic...
Factors for Prevention & Control of Common Diseases Prevention & control of cholera Cholera occurs when people do not have access to effective sanitation facilities and access to clean wate...
Transmission of Common Diseases Transmission of cholera Cholera is caused by the bacterium Vibrio cholerae The disease is water-borne (the bacterium lives in water) and food-borne This means the di...
Infectious Diseases A disease is an illness or disorder of the body or mind that leads to poor health Each disease is associated with a set of signs and symptoms Infectious diseases are caused by p...
Gas Exchange Processes The exchange of oxygen and dioxide occurs between the alveoli and the capillaries in the lungs Oxygen and carbon dioxide are exchanged in a process of simple diffusion; (pass...
The Gas Exchange System: Structure & Functions Ciliated epithelial cells, goblet cells and mucous glands play vital roles in maintaining the health of the gas exchange system Cartilage, smooth ...
Recognising Structures in the Gas Exchange System Trachea Trachea cross-section A tracheal cross-section shows the large lumen which air has to travel through The innermost cells of the trachea are...
Recognising Tissues in the Gas Exchange System Cartilage Cartilage micrograph Cartilage – electron micrograph The cartilage in the trachea has a ‘glassy’ appearance due to its translucent protoplas...
