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ATP is constantly created by muscles, cannot be stored, but be used.

Creatine Phosphate (CP) is the storage molecule for ATP.
ATP + CP = ADP + CP

Energy stored in CP can convert ADP back to ATP
ADP + CP = ATP + creatine (enzyme used is CPK)

Requires O2

Primary energy source for resting muscles

Can use variety of nutrients for ATP (glucose, fats, amino acids)

Slower than anaerobic

Glucose + O2 yields ATP + H2O + CO2

Produces 34 ATP molecules per glucose

Doesn't require O2

Primary energy source for peak intense muscle activity

Produces 2 ATP per glucose

Yeilds ATP + Lactic Acid

Occurs in Cytoplasm

Limited nutrients can be used

Occurs quickly, but not for long

Lactic acid lowers pH, causes pain.

Cells: Long, striated, branching, one nucleus

Contraction is autorhythmic

Contraction sustained by aerobic metabolism (does not fatigue)

Intercalated disks, facilitates AP conduction between cells; cells function as unit

Cells: Small, spindle-shaped, one nucleus

Contain less actin and myosin, not organized in sarcomeres

Contracts slowly

Contraction can by autorhythmic
  - Involuntary (does not require NS)
  - Contractions can be altered with NS or Hormones

Organized to form layers
  - Have special intercellular connections, allows cells to function as unit

Doesn't require O2

Primary energy source for peak intense muscle activity

Produces 2 ATP per glucose

Yeilds ATP + Lactic Acid

Occurs in Cytoplasm

Limited nutrients can be used

Occurs quickly, but not for long

Lactic acid lowers pH, causes pain.