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Chapter 9

Question	Answer
Striated and voluntary	skeletal muscle
found in the walls of organs or viscera	smooth muscle
found in the walls of blood vessels	smooth muscle
striated and involuntary	cardiac muscle
found in the heart	cardiac muscle
nonstriated and involuntary	smooth muscle
found attached to bones	skeletal muscle
the only type of muscle that is nonstriated	smooth muscle
the only type of muscle that is voluntary	skeletal muscle
must be innervated by a somatic motor nerve	skeletal muscle
cordlike structure that attaches muscle to bone	tendon
small bundles of muscle fibers	fascicles
connective tissue that surrounds individual muscle fibers	endomysium
flat sheetlike fascia that attaches muscle to muscle or muscle to bone	aponeurosis
connective tissue that surrounds the fascicles or bundles	perimysium
connective tissue that surrounds a whole skeletal muscle	epimysium
series of contractile units that make up each myofibril; extends from Z line to Z line	sacromere
Thin protein filaments that extend toward the center of the sacromere from the Z lines	actin
thick protein filaments whose "heads" form cross-bridges when they interact with the thin filaments	myosin
Calcium is stored within this structure in the relaxed muscle	sarcoplasmic reticulum (SR)
an extension of the sarcolemma or cell membrane that penetrates the interior of the muscle; the electrical signal runs along this membrane toward the sarcoplasmic reticulum	t tubule
the temporary connection formed when the myosin heads interact with the actin, causing muscle contraction	cross-bridge
the troponin-tropomyosin complex and this protein are called the thin filament	actin
the muscle responsible for most of the movement in a group of muscles; called the chief muscle	prime mover
muscle attachment to the moveable bone	insertion
an increase in the size of a muscle because of overuse	hypertrophy
muscle attachment to the stationary bone	origin
helper muscle; works with other muscles to produce the same movement	synergist
abnormal formation of fibrous tissue in muscles; preventing normal mobility	contracture
muscle that opposes the action of another muscle	antagonist
wasting away or decrease in the size of the muscles	atrophy
classified as disuse, denervation and senile	atrophy

Created by: annabellaperezz

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