motion

stabalizing and posture

Heat production 

Attached to bones

Moves the bones

Multinulicated

Controled voluntarily 

In the walls of the heart

Pumps blood

Branched shape

Involuntary 

In the walls of visceral organs

moves stuff through organs and act as sphincter

Single nucleus

Involuntary 

Excitability (irriatbility)

Contractility- ability to forcably shorten

Extensibility- ability to extend

Elasticity- ability to go back to resting length 

Has skeletal muscle, connective tissue, blood vessels, and nerves.

Each mucles has 1 main artery, 1 vien, and 1 nerve that enter/exit near the center of the muscle and branch profusely. 

the connective tissue wrappings are continous with each other and the tendons (join muscle to bone)

help transmit "pulling force" when muscle contracts

Provide entery/exit for blood vessels & nerves 

long, cylindrical cells

lie parallel to each other 

Mean- group of cells fused during embryonic development

Explains- why the cells are and have/need multiple nuclei.

Cytoplasm of muscle cells

80% myofibrils

Organelles of the muscles cell

Parallel rods that run the length of the cell

Responsible for conractility 

Specialized ER cells that are located in the muscle superficial to myofibrils

series of tublules that end at terminal cisternae.

Regulates intercellular Ca++ 

Hollow elongated tube projection into muscle cell from SR

Between terminal cisternia

Contain ISF

Help spread AP's 

Most of the thin filament made of polypeptide chains

G-actin are long strands

F-actin are long strains twisted together

3 parts... binds actin, myosin, and Ca++

Regulatory protiens 

Spirals around actin helps stiffen actin back bone

Regulatory protien 

Protien

froms crossbridges with actin

2 globular heads and 1 rod tail

Heads have binding sights