HOMEOSTASIS
, HOMEOSTASIS
=
Regulation/maintainence of a constant internal environment
keep optimum conditions in response to external/internal changes
↳ for enzyme action & cell functions
CONTROLS :
1 Blood concentration
glucose
2
Body temp.
3 Water levels
* Homeostasis involuntary control system (automatic
-
involves nervous responses/chemical
ALL CONTROL SYSTEMS INCLUDE :
Receptors cells that detect stimuli (changes in environment)
Coordination centres receive X
process info from receptors (e g.
.
brain ,
spinal corda
pancreas (
Effectors- bring about responses to restore optimum levels (glands & muscles
NEGATIVE FEEDBACK
① Receptor detects a stimuli too high/low
② coordination centre receives & processes info+ organise response
③ Effector produces response to counteract & restore level t/9
* Effectors producing response long stimulated coordination centre
carry on as as
by
↳ cause
opposite problem negative feedback
, THERMOREGULATION
Thermoregulatory centre found in
hypothalimus
Receptors to monitor temp. of blood
-
-
Receptors in skin to send impulses to brain
IF TOO HIGH :
-Sweating
·
From sweet glands
Evaporation skin to increase energy transfer
·
on
vasodilation
-
·
Blood vessels widens so closer to skin
·
Increased energy transfer from blood to skin
IF TOO LOW :
sweating stops
-
shivering
-
Contraction
·
of muscles to generate heat from respiration
-
Hair stand on end
·
create an insulation layer to trap warm air
-
Vasoconstriction
Blood vessels constrict
away from skin
·
·
Less heat loss
, HOMEOSTASIS
=
Regulation/maintainence of a constant internal environment
keep optimum conditions in response to external/internal changes
↳ for enzyme action & cell functions
CONTROLS :
1 Blood concentration
glucose
2
Body temp.
3 Water levels
* Homeostasis involuntary control system (automatic
-
involves nervous responses/chemical
ALL CONTROL SYSTEMS INCLUDE :
Receptors cells that detect stimuli (changes in environment)
Coordination centres receive X
process info from receptors (e g.
.
brain ,
spinal corda
pancreas (
Effectors- bring about responses to restore optimum levels (glands & muscles
NEGATIVE FEEDBACK
① Receptor detects a stimuli too high/low
② coordination centre receives & processes info+ organise response
③ Effector produces response to counteract & restore level t/9
* Effectors producing response long stimulated coordination centre
carry on as as
by
↳ cause
opposite problem negative feedback
, THERMOREGULATION
Thermoregulatory centre found in
hypothalimus
Receptors to monitor temp. of blood
-
-
Receptors in skin to send impulses to brain
IF TOO HIGH :
-Sweating
·
From sweet glands
Evaporation skin to increase energy transfer
·
on
vasodilation
-
·
Blood vessels widens so closer to skin
·
Increased energy transfer from blood to skin
IF TOO LOW :
sweating stops
-
shivering
-
Contraction
·
of muscles to generate heat from respiration
-
Hair stand on end
·
create an insulation layer to trap warm air
-
Vasoconstriction
Blood vessels constrict
away from skin
·
·
Less heat loss
