5.1 homeostasis

define homeostasis

maintenance of a constant internal environment (temperature, blood glucose, pH and concentration

how is homeostasis is achieved

endocrine and nervous system

define a feedback system

a system that alters the original stimulus

what is a negative feedback system

the response is opposite to the original stimulus

what is a positive feedback system

the response intensifies the original stimulus

what is dynamic equilibrium

when in a negative feedback system, input and output of materials are balanced

what do feedback system loops contain

stimulus- change in the environment

receptor-detects the change

modulator-responsible for processing info received from the receptor and sending it out to the effector

effector-carries out a response

feedback- original stimulus is changed

what is another name for negative feedback systems

steady state control system

what is a set point

point at which conditions of an internal environment fluctuate

defne tolerance limits

upper an lower limits between which the levels fluctuate

upper= exceeded.

lower= subceeded.

what are examples of a positive feedback system?

blood clotting and childbirth