Factors in the environment that an organism reacts to, such as light, temperature, and sound are known as <u>stimuli</u>.
In the field of ecology, abiotic factors can be described as the non-living components of an ecosystem. When an organism reacts to these abiotic factors such as light, temperature, and sound then these are perceived as stimuli.
A stimulus is a change in the environment that is detected by the sensory receptors. A signal is carried through these receptors to the central nervous system (CNS). The central nervous system interprets this message and sends a response signal through the effector motor neurons to respond to the stimulus.
The intensity of a stimulus is measured by the number of action potentials that are received by the central nervous system (CNS).
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