Download Muscle CELL

MUSCLE TISSUE PPT1
• What are the parts of muscles?
Muscles are covered by skin
Each muscle is distinct and named
Muscle tendons attach to bone
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EPImysium
wraps whole muscle
Tendon
Each part of the muscle is
wrapped in a connective
tissue wrapping (fascia) which
protects the cells, and gives
some stretch and strength
to the muscle
(b)
ENDOomysium
(wraps individual
muscle cells)
PERImysium
Wraps a bundle of
muscle cells
Fascicle:
A bundle of muscle cells
Muscle CELL
(somethimes
called a fiber)
Figure 9.1
Parts of a muscle cell
Width of one sarcomere
Part of a skeletal
muscle fiber (cell)
Z disc
Z disc
Myofibril
Sarcolemma
Sarcolemma
Triad:
• T tubule
• Terminal
cisternae
of the SR (2)
Tubules of
the SR
Myofibrils
Mitochondria
Each sarcomere is covered by sarcoplasmic reticulum (SR)(blue)
Each sarcomere has T tubules (white tube) running over the Z disc
Underneath the T tubules and SRs are the thin and thick filaments
Figure 9.5
MYOFIBRILS are broken into smaller units called SARCOMERES
SARCOMERES are made of smaller units called FILAMENTS (myofilaments)
Z disc
Z disc
(c) Small part of one myofibril enlarged to show the myofilaments
responsible for the banding pattern. Each sarcomere extends from
one Z disc to the next.
Sarcomere
Z disc
Z disc
Thin (actin)
filament
Elastic (titin)
filaments
Thick
(myosin)
filament
(d) Enlargement of one sarcomere (sectioned lengthwise). Notice the
myosin heads on the thick filaments.
Figure 9.2c, d