Muscles

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Muscles

Finite supply of ATP is what makes it possible to maintain vigorous muscle activity indefinitely

Two types of contractions

Isometric

No change in length

Isotonic

Change in length

Contains actin and myosin, proteins

3 Types

Motor Units

Group of muscle fibers that get all their signals from the same single motor neuron

Small muscle units= fine motor skills

Twitches

Relaxation Period

Calcium gets pumped into sarcoplasmic reticulum

Period Of Contraction

Binding and pulling of muscles

Tetanus

All little twitches blend together until they feel like one large contraction

Latent Period

Stimulent has arrived, no force

Skeletal Muscle

Sliding Filament Model

Shows how skeletal muscles work

Found generally around bones

4 Types

Prime Movers

Agonists, adduction

Antagonists

Work in reverse, abduction

Synergists

Help prime by lending extra power

Fixators

Stabilize joints against dislocation

Cardiac Muscle

Only found in the heart

Control heart beat

Striated

Smooth Muscle

Found in the wall of organs

Control breathing, movements of digestive system, keeps organs functioning involuntarily

Not striated