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.
what are ways that pathogens can cause disease in their hosts. viruses replicate by inserting their genetic material into a host cell and taking over many of the host cell's functions. bacteria breaks down the tissue of an infected organism for food or release toxins that interfere with normal activity in the host. fungi causes infections on the surface of the skin, mouth, throat, fingernail, and toenails. protists may infect people through contaminated water and insect bites.