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21 terms

Muscular System (Bio101)

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Synaptic Knob
End of an axon that contains vesicles filled with the neurotransmitter acetylcholine
Myofibrils
A functional level of muscle tissue made up of actin and myosin filaments. These are responsible for muscle contractions
Sarcomere
Basic functional unit of a muscle cell.
Muscle Tone
A partial but sustained muscle contraction. Common in muscles of the back
All-or-none Response
When a muscle fiber descides to contract, it will contract completely
Isometric contractions
Contraction of muscles without changing the length of the muscle. Example: standing at attention, pushing a wall
Creatine Phosphate
An energy supply for the synthesis of ATP molecules.
Myoglobin
Protein molecule that stores oxygen
Hypertrophy
Muscle growth from training or usage
Atrophy
Lack of muscle usage leading to decrease size, tone, and power
Isotonic Contractions
Contraction of muscles that changes the length of the muscle. Examples: lifting objects, running
ATP
Energy source for muscle contractions. Without it muscles may cramp and not contract
Skeletal Muscle
Voluntary, striated muscle found through out the entire body
Cardiac Muscle
Involuntary, striated muscle found only in the heart. Contains intercalated disks
Smooth Muscle
Involuntary, non-striated muscle found in vessels and organs.
Origin
Less moveable end of muscle attachment. Fixed end
Insertion
Moveable end of muscle attachment.
Action
The movement made based on the muscle. Example: flexion
Rectus abdominus
AKA "six-pack" inserts on the superior surface of the pubis and around the symphysis
Biceps brachii
Muscle that when contracted causes the arm to flex
Triceps brachii
Muscle that when contracted causes extension of the arm. Extends arm during push ups