Body Structures & Functions
12th Edition
ISBN: 9781285695495
Author: Scott
Publisher: Cengage
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- Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the abovearrow_forwardAny abnormal condition of skeletal muscles is known as _______________________.arrow_forward_______can shorten (contract). a. Muscle tissue b. Nervous c. Connective tissue d. Epithelial tissuearrow_forward
- The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filamentarrow_forward______ muscle pulls on bones and _______ muscle regulates the diameter of blood vessels. a. Skeletal / cardiac b. Smooth / cardiac c. Skeletal / smooth d. Smooth / skeletalarrow_forwardNerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sitesarrow_forward
- Depolarization of the sarcolemma means ________. the inside of the membrane has become Less negative as sodium ions accumulate the outside of the membrane has become less negative as sodium ions accumulate the inside of the membrane has become more negative as sodium ions accumulate the sarcolemma has completely lost any electrical chargearrow_forwardAn incision into a sphincter muscle is a/an ________________________________.arrow_forwardA/An___________________ is a narrow band of nonelastic, fibrous connective tissues that attached muscle to a bone. aponeurosis fascia ligament tendonarrow_forward
- Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_forwardWhy do you think a person is able to perform anaerobic exercise (such as lifting and holding a heavy weight) only briefly but can sustain aerobic exercise (such as walking or swimming) for long periods? (Hint: Muscles have limited energy stores.)arrow_forwardThe term___________________ means pertaining to muscle tissue and fascia. aponeurosis fibrous sheath myocardium myofascialarrow_forward
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