Anatomy & Physiology I and II

Anatomy & Physiology Study Guide

10.5 Chapter Ten Practice Exam 1. The connective tissue coverings of a skeletal muscle, listed from superficial to deep, are _____________. a. Endomysium, perimysium, and epimysium b. Endomysium, epimysium, and perimysium c. Epimysium, endomysium, and perimysium d. Epimysium, perimysium, and endomysium 2. The command to contract is distributed deep into a muscle fiber by the _____________. a. Sarcolemma b. Sarcomere c. Transverse tubules d. Myotubules e. Myofibrils 3. The detachment of the myosin cross-bridges is directly triggered by the _________. a. repolarization of T tubules b. attachment of ATP to myosin heads c. hydrolysis of ATP d. Calcium ions 4. A muscle producing near-peak tension during rapid cycles of contraction and relaxation is said to be in __________________. a. Incomplete tetanus b. Treppe c. Complete tetanus d. A twitch

5.

In what type of contraction does the tension rises, but the load does not move? a. A wave summation b. A twitch c. An isotonic contraction d. Which 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. 7. An 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. The _________________contains vesicles filled with acetylcholine. a. Synaptic terminal b. Motor end plate c. Neuromuscular junction d. Synaptic cleft

An isometric contraction 6.

Both A and C 8.

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