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the ability of a living thing to keep conditions inside its body constant


a state of balance


the control and coordination of all life functions

life processes

metabolism, responsiveness, movement, growth, differentiation, reproduction

internal environment

The materials and conditions INSIDE of a cell or organism. Compare with "external conditions."


Response to a message

physiological activities

bodily changes as a result of certain emotions
e.g fear -> increase of hear rate

external environment

Refers to the conditions that surround a cell or an organism. These conditions are always different from conditions INSIDE the cell or organism.


Process of shortening or making smaller

toxic substances

harmful substances that can be deadly in high amounts

dynamic equilibrium

continuous movement but no overall change

negative feedback

A process in which a system is turned off by the condition it produces.


a change in an organism's surroundings that causes the organism to react

adaptive characteristics

characteristics that help an organisim survive

hormonal feedback

a hormone in the path exerts negative feedback on the sequence

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