Homeostasis Flashcards
What does the term homeostasis mean?
Existence of a stable internal environment
Name the two general mechanisms of homeostatic regulation
Autoregulation & Extrinsic Regulation
Describe autoregulation
Adjustment in response to a local environmental change
Describe extrinsic regulation
- Adjustment in response to an environmental change
- Results from activities of the nervous or endocrine system
What organ systems are involved in the homeostatic regulation of blood pressure?
Cardiovascular system, nervous system, urinary system, and endocrine system
What is a receptor?
Sensor that detects a stimulus or environmental change
What is an effector?
- Cell/organ that responds to the commands of control centre
- Either opposes or enhances the stimulus
What is a control centre
Receives and processes the information supplied by the receptor and sends
out commands
What is negative feedback and provide an example for this?
-Effector activated by control centre opposes original stimulus
-Counteracts/minimises a change
-Triggers automatic response
E.G: control of body temperature & blood pressure
What is positive feedback and provide and example for this?
-Stimulus produces a response that amplifies/enhances the original change
-When dangerous/stressful process must be completed
quickly to restore homeostasis
EG: blood clotting
