WorksheetsMuscle fiber 1-12 slides
Total questions: 38
Worksheet time: 32mins
Functions of the muscular system?
Movement of body parts and organ contents
Maintain posture and prevent movement
Communication - speech, expression &
writing
Control of openings and passageways
Body heat production
What are the three types of Muscle?
Skeletal, Cardiac, Smooth
Striated, Peripheral, Continuous
Cuboidal, Squamous, Epithelial
Where is skeletal muscle found? How does it function?
It is a voluntary muscle attached to bones
It is striated
It is under voluntary control.
It is found in heart
What are the universal characteristics of muscles?
Responsiveness (excitability)• capable of response to chemical signals, stretch signals•respond with electrical changes across plasma membrane
Conductivity•local electrical change triggers a wave of excitation that
travels along the muscle fib
Contractility -- shortens when stimulated
Extensibility -- capable of being stretched
Elasticity -- returns to its original resting length after
being stretched
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Plasma membrane of muscle fiber is known as
sarcoplasm
sarcolemma
sarcomere
tubule
This structure of the muscle fiber has transverse (T) tubules that penetrate the cell and carry electric current to cell interior
sarcoplasm
sarcolemma
sarcomere
The cytoplasm of the muscle cell is called
sarcolemma
sarcoplasm
sarcomere
Sarcoplasm (cytoplasm) is filled with
myofibrils (Bundles of protein myofilaments)
glycogen (stored energy)
myoglobin (binds oxygen)
•Sarcoplasmic reticulum
network around each myofibril
Dilated end-sacs called TERMINAL CISTERNEA) store what?
CALCIUM
PHOSPHORUS
RIBOSOMES
DNA
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Myofibrils fill most of the sarcoplasm. Protein myofilaments are key to muscle contraction. Name the two kinds of myofilaments?
Thick Filaments
Thin Filaments
Medium Sized Filaments
T Tubule
Together, the thin and thick filaments form a
sarcolemma
sarcomere
sarcoplasm
Label the top left white spot of the figure a (myosin molecule)
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Label the top right white spot of the figure a (myosin molecule)
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Label the bottom right white spot of the figure b (myosin molecule)
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This type of filament is made up of several hundred myosin molecules, shaped like a golf club and heads directed outward
thick filament
thin filament
Fat filament
Thin filaments are made up of
Fibrous Actin
Tropomyosin
Troponin
In a thin filament , fibrous actin is
(2 answers)
two intertwined strands
bind to head of myosin molecule
binds calcium
In a thin filament, Tropomyosin molecules
bind calcium
each blocking six or seven active sites on G actin subunits
Troponin Molecule :
Binds calcium to unlock actin binding site
bind to head of myosin molecule
