Muscular Muscular SystemSystem

Terminology (pg. 167)Terminology (pg. 167)

myo- fasciculus

sarco- platys

iso- tonos

syn- -trophy

tetanos caput

IntroductionIntroduction• Over 600 muscles

• Lots of mitochondria and blood vessels

• 45% of body weight is muscles

FunctionsFunctions1. Locomotion: move skeleton

2. Posture: some muscles are always partially contracted

3. Maintain body temperature by producing heat

4.Respiration and circulation

5. Guarding entrances

and exits (sphincters)

• 6.Movement along internal passageways (peristalsis)

7.Communication (verbal and body language)

CharacteristicsCharacteristics

• 1. Excitability-ability to respond

2.Contractibility-ability to shorten

• 3.Extensibility-ability to stretch

• 4.Elasticity-ability to return to previous length

Types-SkeletalTypes-Skeletal

striated-appear lined

voluntary

lots of nuclei in the cell

SmoothSmooth

• Non-striated

• Involuntary

• Spindle shaped

CardiacCardiac

• Striated

• Involuntary

• Branched intercolated disks