Homeostasis Flashcards
what are the two types of physiological control?
intrinsic and extrinsic
what are intrinsic controls?
local controls that are inherent in an organ
what are extrinsic controls?
regulatory mechanisms initiated outside an organ, and are accomplished by the nervous and endocrine system
what is feedforward
responses made in anticipation of change
what is feedback
responses made after change has been detected
what are the two types of feedback systems and what d o they do?
positive feedback system: amplifies an initial change
negative feedback system: opposes an initial change
what is the definition of homeostasis?
the maintenance of steady states within our bodies by co-ordinated physiological mechanisms
what must a negative feedback control system be able to to in order to maintain homeostasis?
must be able to:
> sense deviation from desired range in a regulated variable that needs to be kept within a narrow range ie a set point
> integrate information with other relevant information (ie the sensor will produce an output)
>and then the control centre will issue effectors to make appropriate adjustments in order to restore regulated variable to its desired range
what are some examples of variables that are regulated by negative feedback mechanisms?
MABP
core body temperature
blood glucose
blood gases
what are some examples of variables that are regulated by negative feedback mechanisms?
MABP core body temperature blood glucose blood gases and pH
what are the primary homeostatic mechanisms?
negative feedback control mechanisms
