The basic unit of structure and function in living things
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Atom
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the basic unit of a chemical element.
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Organ
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A collection of tissues that carry out a specialized function of the body
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Homeostasis
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process by which organisms maintain a relatively stable internal environment. Receptors - Control Center that includes a set point - Effectors such as muscles of glands take action.
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positive feedback
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Feedback that tends to magnify a process or increase its output.
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Organism
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An individual living thing
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Molecule
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A group of atoms bonded together
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Macromolecules
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A very large organic molecule composed of many smaller molecules
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Tissue
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Specialized cells assemble into layers or masses that have specific functions. Such a group of cells is called a tissue.
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negative feedback
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a mechanism of response in which a stimulus initiates reactions that reduce the stimulus
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organ system
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group of organs that work together to perform a specific function
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Organelle
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A tiny cell structure that carries out a specific function within the cell