Flashcards in Physiology: Intro to Human Physiology and Homeostasis Deck (11)
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1
Q
homeostasis
A
maintenance of steady states within narrow ranges within the body co-ordinated by physiological mechanisms
2
Q
a control system must do what to maintain homeostasis
A
- sense deviations
- integrate that with other relevant information
- make adjustments to restore controlled variable to within range
3
Q
two groups of control systems
A
- intrinsic controls
- extrinsic controls
4
Q
intrinsic control systems
A
- local control inherent to an organ
5
Q
extrinsic control systems
A
- regulatory mechanisms initiated outside an organ (nervous and endocrine)
6
Q
feedforward responses
A
in anticipation of change
7
Q
feedback responses
A
after a chnage is detected
8
Q
positive feedback
A
amplifies change
9
Q
negative feedback
A
opposes initial change
10
Q
what are the components of a negative feedback system and their functions
A
sensor - monitor controlled variable
control centre - compares sensors input with set point
effector(s) - makes a response to produce desired effect
11
Q
draw out the flow chart describing negative feedback
A
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