Muscle

• 1) Skeletal:
• multinucleate; obvious striations

• 2) Cardiac:
• less obviously striated; intercalated discs

• 3) Smooth Muscle:
• dense bodies; kind of look like a pack of ghosts

The dark bands (A-bands) are where the actin and myosin overlap one another

The light bands (I bands) are where there is only actin (off of the z lines)

1) Endomysium: Surrounds a muscle fibre (cell)

2) Perimysium: Surrounds a muscle fasicle

3) Surrounds muscle

All are connected with one another and extend beyond the muscle to the tendon. Makes tendons very deeply rooted.

Red (type I): good for posturing, LOTS of myoglobin, many mitochondria, mostly oxidative phosphor., slow twitch

White (Type IIa, intermediate): 400m race, oxidative and anaerobic, the most mitochondria, fast twitch, intermediate

White (Type IIb): 10s sprint, anaerobic, low myoglobin, lots of glycogen, easily fatigable, fast twitch

They are myogenic stem cells located between basal lamina and plasma membrane. They either become new muscle nuclei or mother satellite cells. When depleted: patholigic conditions like muscular dystophy.

Location:  attached to skeleton; some visceral (e.g. tongue, diaphram, esophagus)

Function: Locomotion, heat, breathing, swallowing,

• Blood:
• Main artery is deep (with V and N) -> branch arteries go along perimysium -> these branch arteries send capillaries into endomysium (capp.'s are usually parallel to fibre)

Nerve: axon branches and supplies many fibres at the NMJs. One branch for each fibre.

• 
• Uses the stretch of collagen fibres instead of intrafusal muscle