Blood Glucose Control

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  • Created on: 12-04-13 12:40
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Hormones are:
1.Produces by
glands,
which
secret
e t
he hormone
dir
ectl
y i
nto
the
b l
ood.
(
E ndocr
ine gl
ands)
2.Carri
ed i
n t
he
blood
plasma t
o t
he cel
ls
on which
they act
(
TA RGE T CELLS)
which
have recept
ors
on thei
r
cel
l
me mb r
an es
wh i
ch ar
e COMPLEMENTORY
t
o t
he
hormo ne.
3.Are
effect
ive
in
very
sma l
l
quanti
ti
es
but
ha ve
long
last
ing
e f
fect
s
4.They don'
t
ca use
a change,
t
hey j
ust
`car
ry t
he messag e'
The Homeostatic Control of Blood Glucose
Bl
oo d
glucose
concentrat
ion
is
normall
y maint
a i
ned at
3.
5 5mmol
sdm 3
t
o pr
ovi
de
a
cont
inuous
sup pl
y t
o t
he respi
ri
ng
cell
s.
T hi
s i
s
p ar
ti
cular
ly
i
mpor
tant
f
or the
BRAIN
which
has no
reserve
stor
e
of
respi
rabl
e ma t
eri
al.
Factors Influencing Blood Glucose Concentration
I
ncr
eased
Level
s:
Eat
ing.
The
digest
ion and absor
pti
on of
f
ood i
n t
he
small
i
ntest
ine,
.
St
ored
glycogen
is
co nver
ted t
o gl
ucose
(Li
ver)
Adr
enali
ne i
ncreases t
he rel
ease of
gl
ucose
fr
om gl
ycogen.
Decr
eased
Level
s:
I
n t
he cel
ls,
gl
ucose
is
used
for
respi
rat
ion.
I
n t
he l
i
ve r
gl
ucose
is
convert
ed t
o gl
ycogen and
stor
ed
(and
in
muscl
es)
The
ki
dn eys some
g l
ucose
ma y
be l
ost
in
uri
ne
NB.
Normal
ly
in
the
kidneys
glucose
is
returned
to
the bl
ood so
none
is
excr
eted
BUT
then
3
gl
ucose
level
s exceed
7mmo lsdm,
glucose
is
lost
i
n ur
ine.
GYLCOGENESIS
For
ming
gly
cogen
GLUCONEOGENISIS Product
ion
of
new gl
ucose,
i
.e.
Glucose
fr
om sour
ces
other
t
han car
bohydr
ate.
The
Liv
e r
f
or
examp l
e can
make gl
ucose f
rom gl
ycer
ol
and
amino
aci
ds.
GLUCOGENISIS f
ormi
ng
glucose
fr
om
glycogen

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The Roles of Insulin and Glucagon
I
nsuli
n and
glucagon
are
ma de
in
the
endocri
ne
secret
ory
cel
ls
of
the
ISLETS OF
LANGERHANS in
the
PA NCRE AS.
Alpha
( )
cel
ls
secr
ete
glucagon
and
beta
( )
cel
ls
secr
ete
insul
in.
The
in suli
n
is
secret
ed when t
he bl
ood gl
ucose l
evel
RISES
aft
er an
int
ake
of
a
carbo h ydrat
e
me al
.…read more

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