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.
Before we go into the details of how does bacteria cause diseases, it is important to understand the difference between 'infection' and 'infectious disease'. When an organism is able to lodge itself in or the tissue of the host and multiply, it is called an infection. However, not every infection leads to a disease.f these infectious agents, one of the most common cause of serious illnesses in humans is bacteria. They are really, tiny microorganisms that are visible only with the aid of a microscope. These tiny microorganisms have a specific pathway that leads to development of an infection in an otherwise healthy person.