The difference between an external stimulus and an internal stimulus is that an external stimulus is a stimulus that comes from outside an organism. But an internal stumulus is a stimulus that comes from inside an organism. An example for an external stimulus can be that when you are cold, you put on a jacket. An example for an internal stimulus is that when you feel hungry, you eat food.
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what is the difference between the external & internal indicator
External respiration, the process by which gases are exchanged between the atmosphere and the pulmonary loop of circulationWhereas,Internal respiration: the is the gaseous exchange between the blood and tissue ( and also cells)
A stimulus is a change in an organism's surroundings or body which causes it to respond. Hence, a response is an organism's reaction to a specific stimulus.
a polysynaptic reflex
Basically the differences are that: the process of aquisition is very different eg c.c uses a number of trials whereas o.t.l only primarily uses one. you can use almost any stimulus in c.c but in o.t.l food is nearly the only effective stimulus. the extinction is very different as c.c can easly become extinct but o.t.l is relativley permanent stimulus generalisatino is common in c.c but hardly ever occurs in o.t.l