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Edexcel SNAB A Level Biology Topic 7 Summary Notes

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Notes for Edexcel A A-level Biology Topic 7, concise and detailed notes aimed for A/A* grade

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RUN FOR YOUR LIFE

,Muscles and movement Muscle Structure


- ont structure




tendon




- connective
> tissue




-
bundle of muscle libres


one muscle libr -


~myofibrils
sarcomere &
Myofibril Schre

2 line





3 3
My ,
and I band
A band
117




·
↑m line



ligaments
>
-

type of connective tissue

> oin
-
bone to bone I

It b and
>
-
elastic + swelchy : allows joint to move where It needs to
,
but keeps bones aligned
>
-
If not stretchy =
world shap everytime joint bent


Huxley Investigated the secure of myofibrils
Tendon
·




>
-
type of connective +issue
·

Myocibrils contain bundles of thick and thin filaments that more past elo to make muscles


> Join
- muscle to bone contact :



> thick
-

myocilaments made of protein
strekthy allow muscles pull up bone
:
> not
- elastic + = to on myosin

>
-
is elastic = when a muscle contracted to more a joint it
,
would stretch the tendon and joint wouldn't - thin myofilaments made of protein actin

move :
·
under an election microscope

Iskeletal) Muscle >
-
Park band containing thick myosin filaments
-
A band

> type or muscle you use to more
199 triceps and biceps filaments - Ibands
light band thin myosin
-
>
-

containing

>
-
join bone to tend on ·
made up of many short rulls-sarcomeres


>
-
contract and relax to moves bones at a joint ·
ends of sarcomere
-
2 line

filament M line
cartilage middle each sarcomere/myosin
-
·
of


>
-
strong , spongy tissue ·
It-zone only contains myosin filaments

end to protect the end of the bone Sliding Filament theory
>
-
forms around the of ball and socket
, hinge and pivot joints
> when we m ove
-
acts to absory shock 1) Ca
"
cons attach to the troponin molecule causing it to move
,


>
-
arthritis = when cartilage wears down and ends of bones in a joint grind together when it is moved 2) As a result ,
the tropomysin on the actin filament shifts in position , exposing myosin binding

>
-
also absorbs synovial clid sites on the activ claments

synovial frid actin clament corming o s
Myosin headbindsthemyosin
binding the
3) sites on
,



>
-
help reduce frichon on bones

> shock absorber myosin head bunds to actin App and Pi on the myosin head are released
-
4) when ,




>
-
lubricant 5) Myosin changes shape and energy in myosin head causes myosin head to move this movement


Antagonistic Muscles * muscle fibre/myofibrill results in the relative movement of the filaments ; the attached actin slides along over the myosin
*
sarcomere shorrens
·
sheletal movements can only be produced by muscles pulling bones 6) An ATP moleluce bunds to the myosin head . This causes the myosin head to detach


·
pair of muscles required to allow movement about the joints - one to generate a force on each planet) An Arpase on the myosin head hydrolyses the ATP , forming App and Pi


of movement 8) This hydrolysis provides the energy that1 1 stored in myosin head , causing myosin head to reset


opposite directions to generate movement to i ts bright position
·



pairs of muscle act in


9) ATP will transport calcium lons back into the sarcoplasmic reticulum
Types of joints

Aerobic Respiration

CoHi 00 .
+ GOr (6CO2 + 6H20 +
energy
released is used to Phosphorylate ADD to ATP
·

energy
:
·
4 stages

① Glycolysis (cytoplasm)

② Link reaction (mitochondria)

③ Krebs cycle (mitochondria)
Imitonona as
Oxidakvephosphorylahon
+ insrae

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