MUSCH → actin H
A Sarcomere
sm.mu/inunun+aryy#q
zone→ thick
-7--7 bundle
of A- band 1¥ myosin only
-
→ Muscle → → each fibre → each cell → each
myofibril → 2
myogiiaments
muscle
fibres = a cell = bundle →
myosin a re A- band -0 length of myosindark)
of myofibrils I band-0 light band ( actinon's)
÷[Éɥɥa ↳
-
skeletal / voluntary nuclei .sk 9-8-8 8--0--0--0060003008 -8-6-38 thick myosin
①
we =
,
↳ Many nuclei many thin actin
we
=
intercalated discs striations
2- → z length d m line
-
A- band same ""9th
Contracted
striations
sarcomere I band dissaeears
-_gE -0--8--0--030 RESTORE
muscle contracts
gliding filament
-
model
uol.vn/tary
when a.band
slide past eachother A ^
actin r myosin 1 I
H
g.
zone
poor
-
① Attach moves tropmyosin
§ ahead @zoaos--o--so £ line
µ oospores
-
Eline sarcomere make up a
cat released from 5. R
This unblocks myosin binding sites
on
.
actin
filament ( 2- line to ZdiÑ↳ to cell
basic
myosin heads bind forming
actin
myosin crossbridges | repeating unit
of a myofibri ,
_a_zf
-
-
a - Boats the actin is '
wrapped around '
thick myosin transverse section I band -0
;; ;;
, : -
;
② Rotate I z z H zone
-
to • •
this binding stimulates the release of ADP - Pri from myosin head ::::
Neuromuscular Junction
inwards overlap to
:
this causes the head to rotate pulling the actin filament . .
"
Reorientate
③ Detach •
" "
"
"
" > action potential arrives at motor end plate
Atp binds to myosin"heads is
hydrolysed """
> neurone releases acetylcholine
Y
""" """"""
" "" " "" " """ """
" "" "
""" "" > "" " "" "" " "" * '
binding further along actin
'
attach to next site
attached to head ready to > depotarises sano lemma
Apgpr pi remain
,
to Nat AP
process repeats
> changing membrane permeability T producing an
tubules
into muscle fibre via -
> AP propagates
> T tubules contacts
.R
"
.
Ca
-
release
> AP causes s.R.to
actin
myosin binding sites
" on
> Tca exposes
attach forming cross bridges "
y myosin heads
-
contraction stops when SR pumps
ca back out
of cytoplasm µ at
> muscle
.
i.
d
i
"
¥÷
Na
'd
d acetylcholine
"
ii. JEFF§
> can
Cazt say
i
-
-
-
-
-
Ca
"
Fd can
Cat
cart
, z I-III z
nmitochondria?
1¥ T
M
-0
Myofibril
H zone
Sarcomere
-
A Sarcomere
sm.mu/inunun+aryy#q
zone→ thick
-7--7 bundle
of A- band 1¥ myosin only
-
→ Muscle → → each fibre → each cell → each
myofibril → 2
myogiiaments
muscle
fibres = a cell = bundle →
myosin a re A- band -0 length of myosindark)
of myofibrils I band-0 light band ( actinon's)
÷[Éɥɥa ↳
-
skeletal / voluntary nuclei .sk 9-8-8 8--0--0--0060003008 -8-6-38 thick myosin
①
we =
,
↳ Many nuclei many thin actin
we
=
intercalated discs striations
2- → z length d m line
-
A- band same ""9th
Contracted
striations
sarcomere I band dissaeears
-_gE -0--8--0--030 RESTORE
muscle contracts
gliding filament
-
model
uol.vn/tary
when a.band
slide past eachother A ^
actin r myosin 1 I
H
g.
zone
poor
-
① Attach moves tropmyosin
§ ahead @zoaos--o--so £ line
µ oospores
-
Eline sarcomere make up a
cat released from 5. R
This unblocks myosin binding sites
on
.
actin
filament ( 2- line to ZdiÑ↳ to cell
basic
myosin heads bind forming
actin
myosin crossbridges | repeating unit
of a myofibri ,
_a_zf
-
-
a - Boats the actin is '
wrapped around '
thick myosin transverse section I band -0
;; ;;
, : -
;
② Rotate I z z H zone
-
to • •
this binding stimulates the release of ADP - Pri from myosin head ::::
Neuromuscular Junction
inwards overlap to
:
this causes the head to rotate pulling the actin filament . .
"
Reorientate
③ Detach •
" "
"
"
" > action potential arrives at motor end plate
Atp binds to myosin"heads is
hydrolysed """
> neurone releases acetylcholine
Y
""" """"""
" "" " "" " """ """
" "" "
""" "" > "" " "" "" " "" * '
binding further along actin
'
attach to next site
attached to head ready to > depotarises sano lemma
Apgpr pi remain
,
to Nat AP
process repeats
> changing membrane permeability T producing an
tubules
into muscle fibre via -
> AP propagates
> T tubules contacts
.R
"
.
Ca
-
release
> AP causes s.R.to
actin
myosin binding sites
" on
> Tca exposes
attach forming cross bridges "
y myosin heads
-
contraction stops when SR pumps
ca back out
of cytoplasm µ at
> muscle
.
i.
d
i
"
¥÷
Na
'd
d acetylcholine
"
ii. JEFF§
> can
Cazt say
i
-
-
-
-
-
Ca
"
Fd can
Cat
cart
, z I-III z
nmitochondria?
1¥ T
M
-0
Myofibril
H zone
Sarcomere
-
