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Neuromuscular Function
Disclaimer – Mrs. Rowe did NOT
create this – but I am sharing it.
Movement Analysis
Neuromuscular Function:
I. The Motor Unit:
4.1 neuromuscular function    carter
II. The Structure of Muscle Tissue:
4.1 neuromuscular function    carter
III. The Role of Neurotransmitters in stimulating
skeletal muscle contraction:
A. Acetylcholine (Ach):
increases the post-
synaptic membrane’s
permeability to sodium
and potassium ions
spreading the impulse
over the entire muscle
fiber.
4.1 neuromuscular function    carter
B. Cholinesterase: enzyme that breaks down Ach repolarizing
the muscle fiber to await another nerve impulse.
IV. Skeletal Muscle Contraction:
4.1 neuromuscular function    carter
4.1 neuromuscular function    carter
A. The sliding filament theory:
Steps of a muscle
contraction:
*Ca++ are released by the
sarcoplasmic reticulum.
*Ca++ binds to troponin
preventing the blocking
action of tropomyosin.
Sliding filament cont.
*myosin heads can now
attach to active sites on
the actin filament.
*myosin heads pulls on
the actin filament,
decreasing the width of
the sarcomere.
*myosin head releases the
actin when a new ATP is
4.1 neuromuscular function    carter
4.1 neuromuscular function    carter
V. Types of Muscle Fibers:
A. Slow Twitch: (type 1)
*smaller in diameter
*reddish color
*use aerobic resp. for ATP
supply
*contain more mitochondria
*fire slowly, but take long to
fatigue.
B. Fast Twitch: used for short explosive movements,
stop and go sports.
Type IIA:
*large diameter
*white in color
*less mitochondria
*uses both anaerobic and
aerobic energy transfer
Type IIB:
*same physical
characteristics as Type
IIA, but strictly uses the
glycolytic anaerobic
system.

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4.1 neuromuscular function carter

  • 1. Neuromuscular Function Disclaimer – Mrs. Rowe did NOT create this – but I am sharing it.
  • 5. II. The Structure of Muscle Tissue:
  • 7. III. The Role of Neurotransmitters in stimulating skeletal muscle contraction: A. Acetylcholine (Ach): increases the post- synaptic membrane’s permeability to sodium and potassium ions spreading the impulse over the entire muscle fiber.
  • 9. B. Cholinesterase: enzyme that breaks down Ach repolarizing the muscle fiber to await another nerve impulse.
  • 10. IV. Skeletal Muscle Contraction:
  • 13. A. The sliding filament theory: Steps of a muscle contraction: *Ca++ are released by the sarcoplasmic reticulum. *Ca++ binds to troponin preventing the blocking action of tropomyosin.
  • 14. Sliding filament cont. *myosin heads can now attach to active sites on the actin filament. *myosin heads pulls on the actin filament, decreasing the width of the sarcomere. *myosin head releases the actin when a new ATP is
  • 17. V. Types of Muscle Fibers: A. Slow Twitch: (type 1) *smaller in diameter *reddish color *use aerobic resp. for ATP supply *contain more mitochondria *fire slowly, but take long to fatigue.
  • 18. B. Fast Twitch: used for short explosive movements, stop and go sports. Type IIA: *large diameter *white in color *less mitochondria *uses both anaerobic and aerobic energy transfer Type IIB: *same physical characteristics as Type IIA, but strictly uses the glycolytic anaerobic system.