7.13AB
External and Internal Stimuli
Picture Vocabulary
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Stimulus
An action or condition that provokes a
response
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Response
Any behavior of a living organism that results
from an external or internal stimulus
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Phototropism
Response of a plant to grow toward or away
from light
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Homeostasis
The tendency of an organism or cell to
maintain a balanced state so as to maintain
health and functioning
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Fight or Flight
The body's reaction related to physiological
changes in the body due to stress
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Tropism
Stems grow away from
gravity while roots grow
toward gravity.
The turning or bending movement of a living
organism or part toward or away from an
external stimulus, such as light, heat, or gravity
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Endotherm
An organism that can maintain a constant
internal body temperature; warm blooded
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Exotherm
An organism that is not capable of maintaining
an internal body temperature; cold-blooded
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