Homeostasis & Physiology Flashcards
What is homeostasis?
The balance among all of the body systems needed for survival
Cell Membrane Potential
Central to the functionality of nerve & muscle cells
Intrinsic Control
Local controls that are inherent in an organ
Extrinsic Control
Regulatory mechanisms initiated outside an organ
Accomplished by nervous & endocrine systems
Feedforward
Term used for responses made in anticipation of a change
Feedback
Refers to responses made after change has been detected
Types of feedback systems
Positive - Amplifies initial change
Negative - Opposes initial change ~ main type of control
What can happen if homeostasis is disrupted?
Disease or Death
Homeostasis & disease
Many diseases are caused by deficient, inappropriate or excessive homeostatic mechanisms
What must a negative feed back control system be able to do?
Sense deviations from a desired range in a regulated variable that requires a set point
Integrate information with other relevant information
Make appropriate adjustments to restore regulated variable to dished range
What are examples of variables regulated by negative feedback mechanisms?
Mean Arterial Blood Pressure
Core Body Temperature
Blood Glucose
Blood Gases
Blood H+ concentration
What does a negative feedback control mechanism involve?
A Sensor, Control Centre & effectors
