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For example, plants can bend toward a source of light or respond to touch. Reflex action is a sudden and involuntary response to stimuli. Organisms respond to diverse stimuli. The key stimulus triggers an innate releasing mechanism (IRM), a sort of middleman, which produces a fixed action pattern (FAP), a definite, constant response. Usually, these behaviors are triggered by a key stimulus (KS). Even tiny bacteria can move toward or away from chemicals (a process called chemotaxis) or light (phototaxis). Response. Pulling our hands away immediately after touching a hot or cold object is a classic example of a reflex action. It helps organisms to quickly adapt to an adverse circumstance that could have the potential to cause bodily harm or even death. A response is a behavior manifested by a living organism as a result of the recognition of either internal or external stimuli. The nervous system includes the central and peripheral nervous systems. Moreover, the central nervous system is responsible for coordinating stimuli and their corresponding responses. For example, plants can bend toward a source of light, climb on fences and walls, or respond to touch (Figure 2). The functions of this response were first described in the early 1900s. Fight-or-flight response, response to an acute threat to survival that is marked by physical changes, including nervous and endocrine changes, that prepare a human or an animal to react or to retreat. For example a behavioural response in the circumstances that its cold, a behavioural response would be to put on a jumper, have a hot drink or put a heater on. External stimuli can affect a person's decision-making abilities and choices. A physical or chemical change in the internal or external environment. Irritability is the excitatory ability that living organisms have to respond to changes in their environment. Biology response to stimuli. Living things are capable to rapid changes in the environment. Stimuli and responses are not only associated with the external environment, but are also found in the internal environment of organisms as well. A response can be either a physiological, cellular or behavioral based on the nature of the stimulus. Nematocysts. PLAY. Response to stimuli. Even tiny bacteria can move toward or away from chemicals (a process called chemotaxis) or light (phototaxis). Key Stimuli Certain innate behaviors can be produced in all individuals of the same species. STUDY. For example, when a person is hungry and sees a slice of pizza, internal stimuli from within the body, such as a stomach growl, salivating and hunger pain, indicates the need for food; the external factor, the pizza slice that a person is viewing through sight, serves as the external stimuli. 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