Positive Feedback A form of regulation in which an end product of a process speeds up that process in physiology, a control mechanism in which a change in a variable triggers a response that reinforces or amplifies the change. Negative Feedback A form of regulation in which accumulation of an end product of a process slows the process in physiology, a primary mechanism of homeostasis, whereby a change in a variable triggers a response that counteracts the initial change. Molecule Two or more atoms held together by covalent bonds. Cell The part of a neuron that houses the nucleus and most other organelles.
Organelles Any of several membrane-enclosed structures with specialized functions, suspended in the cytosol of eukaryotic cells. Tissues An integrated group of cells with a common structure, function, or both. Organ Systems A group of organs that work together in performing vital body functions. Organism a creature such as a plant, animal or a single-celled life form, or something that has interdependent parts and that is being compared to a living creature Organs A specialized center of body function composed of several different types of tissues. Population A group of individuals of the same species that live in the same area and interbreed, producing fertile offspring. Ecosystems All the organisms in a given area as well as the abiotic factors with which they interact one or more communities and the physical environment around them Community All the organisms that inhabit a particular area an assemblage of populations of different species living close enough together for potential interaction. Biosphere The entire portion of Earth inhabited by life the sum of all the planet's ecosystems.
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