STUDY. Stimuli and responses are not only associated with the external environment, but are also found in the internal environment of organisms as well. Irritability is the excitatory ability that living organisms have to respond to changes in their environment. Response to stimuli. Reflex action is a sudden and involuntary response to stimuli. The functions of this response were first described in the early 1900s. The nervous system includes the central and peripheral nervous systems. 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. External stimuli can affect a person's decision-making abilities and choices. Definition. Even tiny bacteria can move toward or away from chemicals (a process called chemotaxis) or light (phototaxis). Pulling our hands away immediately after touching a hot or cold object is a classic example of a reflex action. Biology response to stimuli. The reaction to a physical or chemical change in the internal or external environment. A behavioural response entails the actions and interactions of the person to try to maintain a balance in the internal body system. Usually, these behaviors are triggered by a key stimulus (KS). Nematocysts. The sense organs, including the eye, contain receptors that are sensitive to stimuli and respond with reflex actions. Stimulus. 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. A response can be either a physiological, cellular or behavioral based on the nature of the stimulus. Moreover, the central nervous system is responsible for coordinating stimuli and their corresponding responses. Even tiny bacteria can move toward or away from chemicals (a process called chemotaxis) or light (phototaxis). something’s from humans there is a behavioural response. Living things are capable to rapid changes in the environment. Biology The response or degree of response, as of a cell, tissue, or organism, to a chemical substance or stimulus, such as a toxin, infectious agent, hormone, allergen, or antigen: insulin sensitivity. The key stimulus triggers an innate releasing mechanism (IRM), a sort of middleman, which produces a fixed action pattern (FAP), a definite, constant response. PLAY. Key Stimuli Certain innate behaviors can be produced in all individuals of the same species. Response. A physical or chemical change in the internal or external environment. Organisms respond to diverse stimuli. Don't try pushing these fellows around! For example, plants can bend toward a source of light or respond to touch. It helps organisms to quickly adapt to an adverse circumstance that could have the potential to cause bodily harm or even death. Organisms respond to diverse stimuli. 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. For example, plants can bend toward a source of light, climb on fences and walls, or respond to touch (Figure 2). A response is a behavior manifested by a living organism as a result of the recognition of either internal or external stimuli.

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