avs350L_Bone_lecture

avs350L_Bone_lecture - Muscles Function Primary role is...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Muscles Function Primary role is movement of the skeletal system Several exceptions: Facial muscles Eye movement & eyelid muscles Tongue Diaphragm Upper esophagus Three types of muscle Cardiac muscle makes up the wall of the heart Smooth muscle - found in the walls is hallow organs of the body (except the heart) Skeletal muscle (striated muscle) muscle attached to skeleton academic.wsc.edu/.../351/actin_myosin.jpg myofilaments tendon- connects skeletal muscle to bone epimysium- fibrous connective tissue around belly of skeletal muscle fasiculi- bundles of muscle fibers perimysium- connective tissue surrounding fasciculus endomysium- connective tissue surrounding the individual muscle fibers (muscle cell) muscle fiber- single muscle cell (threadlike in shape) sarcolemma membrane surrounding the muscle fiber sarcoplasm- specialized cytoplasm of muscle fiber containing multiple nuclei and mitochondria myofibrils- "rod-like" structures running through the muscle fibers that contain the contractile proteins actin an myosin that give the skeletal muscle the striated appearance myofilamnets www.agen.ufl.edu/~chyn/age2062/lect/lect_19/179.gi www.academic.wsc.edu/.../351/actin_myosin.jpg Sarcomere Functional unit of muscle contraction Extends from Z line to Z line Connect neighboring myofibrils A band (dark) area of thick filament with some thin filament over lap Thick filament - myosin protein H zone portion of a band where thin and thick filaments do not overlap Thin filament actin protein M line within the H zone, holds thick filaments in place I band (light) area of thin filaments where they do not overlap thick filaments //users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Muscles.html As a muscle contraction: The z line comes closer together The width of the I band decrease The width of the H zone decreases, but There is no change in the with a the A band As a muscle is stretched: The width of the I bands and the H zone increases There is still no change in the width of the a band biology.kenyon.edu/.../biol105/html/muscle2.jpg Muscle Cell Growth myogenesis Each muscle fiber arises from the fusion of many cells called myoblast....
View Full Document

Page1 / 57

avs350L_Bone_lecture - Muscles Function Primary role is...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online