physiological control systems

Question 1

what 3 things must a control system be able to do in order to maintain homeostasis

Answer 1

sense deviations from the norm in the internal environment
integrate this info with other relevant info
make appropriate adjustments in order to restore variable to desired value

Question 2

what are the 2 classes of homeostatic control

Answer 2

intrinsic controls

extrinsic controls

Question 3

describe what is meant by an intrinsic control

Answer 3

local controls that are inherent to an organ

Question 4

describe what is meant by an extrinsic control

Answer 4

regulatory mechanisms initiated outside an organ, accomplished by nervous and endocrine systems

Question 5

what are the 3 types of homeostatic control systems

Answer 5

feedforward
positive feedback
negative feedback(main type)

Question 6

explain what a feedforward control system is

Answer 6

responses made in anticipation of change, usualyy act in combo with negative feedback

Question 7

explain what a positive feedback control system is

Answer 7

feedback = response made after a change is detected

positive feedback amplifies initial change

Question 8

explain what a negative feedback system is and name its components

Answer 8

negative feedback opposes the initial change, its 3 components are sensors, control centre and effector(s)

Question 9

explain the components of a negative feedback systems and how they work

Answer 9

sensor detects deviation in internal system, informs control centre, control centre sends instructions to effector(s), effector brings about change, result is restoration of variable to norm which leads to negative feedback which shuts off response

Question 10

define the function of a negative feedback system

Answer 10

promotes stability by regulation of a controlled variable through a flow of info along closed loop