Responsiveness to Stimuli

Responsiveness to Stimuli - simultaneously produces an...

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Responsiveness to Stimuli All living things are able to respond to stimuli in the external environment. Stimuli originate from different sources. a) physical: light, heat, temperature, sound. b) chemical: acids and alkali. c) mechanical : friction, pressure. The body has specialized tissue or higher centers to detect stimuli, such as eyes for light, ears for auditory stimuli, the nose for olfactory stimuli, the tongue for taste, the skin for touch, etc. An organism must co-ordinate well to give an appropriate response to the stimuli from the environment. All systems of the body help in this co-ordination, like nerves from the nervous system, and certain chemical regulators called hormones from the endocrine system. This
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Unformatted text preview: simultaneously produces an effect of co-ordination and acts as a sensing system. To respond to the stimuli, the organism has certain efferent units like muscles, glands, hair , etc. The process of response involves the use of energy. The responses are of two types: a) generalized, and b) protective. Protective responses help to promote survival and thus sustain life. A generalized response contribute to the behavior patterns of an organism. For certain classes, the response occurs with a definite pattern which is innate to the organism. Nonliving things don’t respond to stimuli as living things do....
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