Homeostasis. The biological definition of homeostasis is âthe tendency of an organism or cell to regulate its internal environment and maintain equilibrium, usually by a system of feedback controls, so as to stabilize health and functioningâ.ositive feedback mechanisms. A positive feedback mechanism is the exact opposite of a negative feedback mechanism. With negative feedback, the output reduces the original effect of the stimulus.
Bacteria produce disease in one of two general ways; some bacteria damage the cells and tissues of the infected organism directly by breaking down the cells for food, other bacteria release toxins (poisons) that travel throughout the body interfering with the normal activity of the host. Pathogens.
Bacteria are known as pathogens as they are able to cause a disease in plants, insects, animals as well as humans. The ability of bacteria to cause disease is called pathogenicity. This pathogenicity is expressed in terms of virulence.o, not all bacteria cause diseases. You will be surprised to know, less than 1% bacteria have the ability to cause diseases. There are a few beneficial bacteria that help plants, animals as well as humans in various ways.