Ch 9 muscles

laurabockoff's version from 2016-12-13 11:21

Section 1

Question Answer
muscle fiberscigar shaped and multinucleated. The largest fibers of any muscle type
Endomysiumsoft layer of connective tissue. Wraps around a single muscle fiber
Epimysiuma very tough connective tissue layer. Wraps around all the muscle fibers in a muscle
Perimysiuma tougher layer of connective tissue. Surrounds the space of groups of fascicles
Fasiclea buncle of muscle fibers wrapped in an endomysium

Section 2

Question Answer
tendonsmade of collagenic fibers, provides durability and attaches muscle to bone
aponeurosesa combination of all muscle connective tissue layers. Forms strong cordlike structures (tendons). Attaches muscle to bone
visceralanything pertaining to the internal body
intercalated discsspecialized junctions (where cardiac fibers meet) and allows for fast transfer of ions across a sarcolemma

Section 3

Question Answer
originthe less movable or immovable muscle attachments
insertionthe more movable muscle attachment point
prime moverthe muscle mainly responsible for producing movement
antagoniststhe muscle that opposes the prime mover

Section 4

Question Answer
synergistsreduce undesirable or unnecessary movement; used when muscles cross more than one joint ex) bending your fingers and keeping wrist straight
fixatorsstabilize the origin of the prime mover. Increases tension so movement of insertion is smooth
voluntaryaction is normally controlled by an individual's will
striatedlight & dark bands located in cardiac & skeletal
Sarcolemmatubular sheath that envelops the fibers of skeletal muscles.
troponindrags tropomyosin off cross bridge binding sites during contraction
tropomyosinstand that covers the cross bridge binding sites in a resting muscle
Sarcoplasmic reticulumsurrounds muscle fibers. Stores calcium ions during muscle relaxation