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Muscles
Tendon- Joins
Ligament- joins
bone to muscles.
bone to bone.
This muscle is This muscle is
the bicep and the tricep and
is known as is known as an
the flexor extensor
because when because it
it contracts straightens the
the joint joint when it
bends. contracts.
Muscles work in antagonistic pairs because
they can only pull when they contract, they
can never push.…read more

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Joint Structure
Cartilage to
Synovial Fluid- absorb synovial
acts a lubricant fluid, act as a
shock absorber
and give the
bones
protection.
Tendon
Muscle
Synovial
Ligament- strong and Membrane-
FLEXIBLE. Secretes
synovial fluid..…read more

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Contain lots of Muscle Fibres
mitochondria for
energy.
The
sarcoplasmic
reticulum
Multinucleate releases
calcium ions
which are
needed for
muscle
contraction
Myofibril
Bits of sarcolemma fold inwards
across the sarcoplasm. These are
known as transverse tubules and
help spread electrical impulses
across the sarcoplasm to reach all
parts of the muscle fibre.…read more

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Myofibrils and sliding filament theory
Myofibrils are made up of
Thin Actin looks
Z-lines are found at many sarcomeres.
like light bands
the end of each
under electron
sacromere.
microscope.
These are called
I-bands.
Thick Myosin looks
like dark bands
under electron
microscope. These The middle of the
are called A-bands. myosin filaments is
known as the M-line.
To make muscles contract
actin and myosin filaments
slide over each other
simultaneously.…read more

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neus3

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