Multiple ChoiceThe plasma membrane of a muscle fiber is called the ____________ and it wraps bundles of ____________. 927views31rank1comments
Multiple ChoiceTrue or False: if false, chose the answer that corrects the statement.The smallest contractile unit of a muscle is the muscle cell.953views42rank1comments
Multiple ChoiceWhere does 95% of the energy needed for contraction come from during moderate exercise?1322views
Textbook QuestionThe connective tissue covering that encloses the sarcolemma of an individual muscle fiber is called the a. epimysium, b. perimysium, c. endomysium, d. periosteum.518views2rank
Textbook QuestionA fascicle is a a. muscle, b. bundle of muscle fibers enclosed by a connective tissue sheath, c. bundle of myofibrils, d. group of myofilaments.474views1rank
Textbook QuestionThick and thin myofilaments have different compositions. For each descriptive phrase, indicate whether the filament is, a. thick or b. thin. _____ (1) contains actin _____ (2) contains ATPases _____ (3) attaches to the Z disc _____ (4) contains myosin _____ (5) contains troponin _____ (6) does not lie in the I band348views1rank
Textbook QuestionThe function of the T tubules in muscle contraction is to a. make and store glycogen, b. release Ca²⁺ into the cell interior and then pick it up again, c. transmit the action potential deep into the muscle cells, d. form proteins.1145views1rank
Textbook QuestionTrue or false: Most muscles contain a predominance of one skeletal muscle fiber type. Explain the reasoning behind your choice.415views1rank
Textbook QuestionThe primary action of the biceps brachii muscle of the anterior arm is to flex the forearm at the elbow. However, when this muscle is inflamed, pain is felt in the shoulder. Explain this finding.220views
Textbook QuestionWhich of the following types of muscle fibers have low myosin ATPase activity and are classified as slow-twitch?a. Type I fibersb. Type IIa fibersc. Type IIx fibersd. Type III fibers253views
Textbook QuestionMr. Nasheed has cerebral palsy and suffers severe skeletal muscle spasms as a result of his condition. He is prescribed the drug dantrolene, which prevents the release of Ca2+ from the SR. Explain how this will treat his muscle spasms.237views
Textbook QuestionMichael had a nervous habit of chewing on the inner lining of his lip with his front teeth. The lip grew thicker and thicker from years of continual irritation. Michael's dentist noticed his greatly thickened lip, then told him to have it checked to see if the thickening was a tumor. A biopsy revealed hyperplasia, but no evidence of neoplasia. What do these terms mean? Did Michael have cancer of the mouth?170views
Textbook QuestionWhy are the connective tissue wrappings of skeletal muscles important? Name these connective tissue coverings, beginning with the finest and ending with the coarsest. a.161views
Textbook QuestionWhy are the connective tissue wrappings of skeletal muscles important? Name these connective tissue coverings, beginning with the finest and ending with the coarsest. b.134views
Textbook QuestionCompartment syndrome can result from all of the following except (a) compressing a nerve in the wrist, (b) compartments swelling with blood due to an injury involving blood vessels, (c) torn ligaments in a given compartment, (d) pulled tendons in the muscles of a given compartment, (e) torn muscles in a particular compartment.152views
Textbook QuestionWhich of the following statements about myofibrils is not correct? (a) Each skeletal muscle fiber contains hundreds to thousands of myofibrils. (b) Myofibrils contain repeating units called sarcomeres. (c) Myofibrils extend the length of a skeletal muscle fiber. (d) Filaments consist of bundles of myofibrils. (e) Myofibrils are attached to the plasma membrane at both ends of a muscle fiber.124views
Textbook QuestionAn action potential can travel quickly from one cardiac muscle cell to another because of the presence of (a) gap junctions, (b) tight junctions, (c) intercalated discs, (d) both a and c.201views
Textbook QuestionWhat three layers of connective tissue are part of each muscle? What functional role does each layer play?140views
Textbook QuestionMuscle tone keeps muscles healthy. What is muscle tone, and what causes it? What happens to a muscle that loses its tone?129views
Textbook QuestionIdentify the structures in the following figure. a. ___ b. ___ c. ___ d. ___ e. ___ f. ___ g. ___ h. ___151views
Textbook QuestionBill broke his leg in a football game, and after six weeks the cast is finally removed. As he steps down from the examination table, he loses his balance and falls. Why?147views
Textbook QuestionMultiple Choice More than one choice may apply. Your ability to lift that heavy couch would be increased by which type of exercise? a. Aerobic b. Endurance c. Resistance d. Swimming125views
Textbook QuestionThe smooth muscle type found in the walls of digestive and urinary system organs and that exhibits gap junctions and pacemaker cells is a. multi unit, b. unitary.240views1rank
Textbook QuestionCompare skeletal, smooth, and cardiac muscles in regard to their microscopic anatomy, location and arrangement in body organs, and function in the body.160views
Textbook QuestionWhy are the connective tissue wrappings of skeletal muscles important? Name these connective tissue coverings, beginning with the finest and ending with the coarsest. c.106views
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