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Muscles
Terms and facts about muscles.
48
Anatomy
Undergraduate 1
02/10/2012

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Term
3 Basic Types of Muscle
Definition
1.Skeletal; V, Striated
2.Cardiac; I, Striated
3.Smooth; I, Not Striated
Term
3 Layers of Muscle
Definition
1.Fascia/Epimysium- covers everything
2.Perimysium- covers fascicle
3.Endomysium-between fibers(cells) in fascicle
Term
Function of Muscle
Definition
1.Movement 2.Posture 3.Stabilize Joints 4.Heat
Term
Sarcolemma
Definition
Specialized plasma membrane.
Term
Myofibrils
Definition
Long organelles inside muscle cell.
Term
Sarcoplasmic Reticulum
Definition
Specialized smooth ER; calcium.
Term
Sarcomere
Definition
Functional unit of muscle; Z disc to Z disc.
Term
Thick Filament
Definition
Myosin
Term
Thin Filament
Definition
Actin
Term
H Zone
Definition
Thick Filament & M-line.
Term
A Band
Definition
Dark; thick & thin filaments, M-line & H zone.
Term
I Band
Definition
Light; Z disc & thin filament.
Term
Excitability
Definition
Ability to receive and respond to stimulus.
Term
Contractility
Definition
Ability to shorten.
Term
Extensibility
Definition
Stretch without tearing.
Term
Elasticity
Definition
Ability to recoil; tendons help.
Term
Motor Unit
Definition
1 motor neuron (nerve cell) & its skeletal muscle cells.
Term
Neuromuscular Junction
Definition
Association site of axon terminal (synaptic end bulb) of motor neuron and muscle.
Term
Transmission of Nerve Impulse to Muscle
Definition
1.Action Potential arrives at synaptic end bulb.
2.Calcium pores open Calcium rushes in.
3.Calcium "releases" Ach. filled vesicles.
4.Ach, crosses synaptic cleft.
5.Ach binds Na+ in/K+ out.
6.Ach. breakdown.
Term
Sliding Filament Theory
Definition
1.Nerve activation causes myosin heads to bind to sites on actin.
2.Myosin heads then bind to next site and pull them to the center.
3.This action causes sliding of myosin along the actin.
4.Result is muscle is shortened(contracted).
Term
Summing of Contractions
Definition
1 contraction followed by another, not allowed to rest all the way, effects added.
Term
Unfused Tetanus
Definition
Incomplete
Term
Fused Tetanus
Definition
Complete
Term
Aerobic Respiration
Definition
ATP used with oxygen; long range.
Term
Anaerobic Respiration
Definition
ATP used, no oxygen; medium range
Term
Creatine System
Definition
Energy system stored in muscle, immediate; 2 min.
Term
Twitch
Definition
Single brief contraction, not normal.
Term
Causes of Muscle Fatigue
Definition
Oxygen debt, need calcium, injury; anything blocking the pathway.
Term
Isotonic
Definition
Muscles shorten & movement occurs. Ex; knee bend.
Term
Isometric
Definition
Muscles unable to shorten or produce movement. Ex; bent elbow push.
Term
Origin & Insertion
Definition
Muscles; I moves to the O.
Term
Prime Mover
Definition
Muscle with major responsibility for a movement.
Term
Antagonist
Definition
Muscle that opposes/reverses prime mover.
Term
Synergist
Definition
Helps prime mover.
Term
Fixator
Definition
Stabilizes the origin of a prime mover.
Term
Flexion
Definition
Ex.Curls
Term
Extension
Definition
Opposite of flexion. Ex.Push-up.
Term
Rotation
Definition
Movement around longintudinal axis, medial-lateral. Ex. Head shaking no.
Term
Abduction
Definition
Away from the midline.
Term
Adduction
Definition
Toward the midline.
Term
Circumduction
Definition
Combination of flexion,extension, abduction and adduction.
Term
Dorsiflexion
Definition
Toes up.
Term
Plantar Flexion
Definition
Toes down.
Term
Inversion
Definition
Turn sole medially.
Term
Eversion
Definition
Turn sole laterally.
Term
Supination
Definition
Palm up.
Term
Pronation
Definition
Palm down.
Term
Opposition
Definition
Thumb to finger tips.
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