MUSCULAR SYSTEM UNIT 7 Flashcards
Functions are..
- Movement
- Helps to stabilize joints
- Maintains your posture
- Generates heat, helps maintain body temp.
Sk. M Location:
attach to bone
Sk. M Appearance:
Striated, multinucleated
Sk. M Stimulation:
Voluntary
Sk. M Rhythm:
Fast to slow
C. M Appearance:
Striated, one nucleus, intercalated discs
C. M Stimulation:
Involuntary
C. M Rhythm:
Steady
Sm. M Location:
Visceral organs
Sm. M Appearance:
Not striated
Sm. M Stimulation:
Involuntary
Sm. M Rhythm:
Slowest
Muscle cells =
Muscle fibers
Epimysum
Connective tissue membrane surrounding the entire muscle.
Fascicle:
A bundle of muscle fibers
Perimysum:
Connective tissue membrane surrounding a faciculus
Endomysum:
Membrane surrounding each individual muscle fiber
Origin:
Attaches to the bone that it does not move
Can have 2 or 3 tendons
Insertion:
Tendon that attaches to the bone it moves
I Band:
Light band
Contains only thin (actin) filaments
H Zone:
Contains only thick filaments
A Band:
Dark band
Contains the entire length of a thick (myosin) filament
Z Line:
Boundary between sarcomers
Myosin:
Thick filament
Has ‘heads’ to bind to actin
M Line:
“Middle line”
Holds together the myosin myofilaments
Actin:
Thin myofilament
“Two strands of pearls”
Neuromuscular Junction:
Where a nerve meets a muscle
Excitability
The ability of a muscle cell to receive a stimulus
Axon
Delivers a stimulus
Motor Neuron
The neuron that stimulates a muscle
Motor Unit:
A motor neuron and all the muscle fibers it stimulates
Synaptic Vesicles
Contain neurotransmitters —- ACH, Aceity Chloline
Neurotransmitters
Releases the ACH into the synoptic cleff
Synaptic Cleff
The minute gap between the axon terminal and the muscle cell
