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Flashcards in homeostasis Deck (15)
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1
Q

homeostasis

A

“unchanging” dynamic state of equilibrium

internal conditions vary but within narrow limits

2
Q

homeostatic control communication

A

nervous and endocrine systems

neural electrical impulses or blood borne hormones as info carriers

3
Q

homeostatic control system

A
  1. stimulus- produces change in variable
  2. receptor- detects change
    - receptor-
  3. input- information sent along afferent pathway ro control center
    - control center-
  4. output- information sent along efferent pathway to effector
    - effector -
  5. response of effector feeds back to reduce the effect of stimulus and returns variable to homeostatic level
4
Q

receptor

A

some type of sensor that monitors the environment and responds to changes (stimuli) by sending input to the control center

5
Q

input

A

flows from the receptor to the control center along the afferent pathway

6
Q

control center

A

determines the set point

7
Q

set point

A

level or range at which the variable is maintained

8
Q

output

A

flows from the control center to the 3rd component, the effector along the efferent pathway

9
Q

afferent

A

info approaches the control center

10
Q

efferent

A

info exits the control center

11
Q

effector

A

provides means for the control center response to the stimulus

12
Q

feedback

A

to influence stimulus either reducing or enhancing

13
Q

negative feedback

A

output shuts off the original effect of the stimulus or reduces its intensity (most common)
opposite direction to that of the initial change
goal: prevent sudden sever changes within the body

14
Q

positive feedback

A

the result or response enhances the original stimulus so the response is accelerated
same direction as the initial change
“cascades” infrequent events
ex. blood clotting

15
Q

homeostatic imbalance

A

disease or disturbance of homeostasis