Extrinsic regulation
Nervous and or endocrine systems adjust to environmental change
Intrinsic regulations
Cells of tissues adjust to environmental change
Nervous system
Rapid, short term specific responses
Endocrine system
Slower.long term responses, hormones cause the changes to occur
Receptor
Senses a change in the body
Control center
Processes the change, decides how to react
Effector
Cell or organ that responds to the control center, can oppose of enhance the change
Positive feedback
Initial stimulus is continued and exaggerated
Negative feedback
Initial stimulus is opposed, reduced, slowed