Section 38: Muscle - Anatomy Section 38: Muscle - Anatomy 38-1 - PowerPoint PPT Presentation

Section 38: Muscle - Anatomy Section 38: Muscle - Anatomy 38-1

• Muscle types: – cardiac muscle: composes the heart – smooth muscle: lines hollow internal organs – skeletal (striated or voluntary) muscle: attached to skeleton via tendon & movement • Skeletal muscle 40-45% of body weight – > 430 muscles – ~ 80 pairs produce vigorous movement 80 pa s p oduce go ous o e e t • Dynamic & static work – Dynamic: locomotion & positioning of Dynamic: locomotion & positioning of segments – Static: maintains body posture Static: maintains body posture 38-2 From: Ju

Marieb, 1997 From: Garner 38-3

Marieb, 1997 From: Garner 38-4

From: Garner 38-5

Muscle Architecture - Macro Muscle Architecture Macro • Key Words: Key Words: • tendon • Epimysium • • Fasciculae Fasciculae • Perimysium • muscle fibers • • Endomysium Endomysium • myofibril 38-6 From: Legh

Marieb, 1997 From: Garner 38-7

Muscle Architecture - Micro • Key Words: • sarcomere • Actin -double strand, wound Actin double strand, wound • Myosin- twisted golf clubs, heads facing out in a spiral fashion down the bundled tails • Z- line , M - line • cross bridges 38-8 From: Legh

From: Peeler 38-9