Concept explainers
Mark the following statements as true for smooth muscle tissue, cardiac muscle tissue, and/or skeletal muscle tissue.
a._____Actin attaches to dense bodies.
b._____Cells are joined by intercalated discs.
c._____The thick and thin filaments are arranged into sarcomeres.
d._____The thick filaments contain myosin heads along their entire length.
e._____The cells depolarize and contract as a unit.
f._____
g._____
h._____The sarcolemma has a distinct motor end plate.
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Human Anatomy & Physiology (2nd Edition)
- The sliding filament mechanism describes the process during which: a. actin and myosin slide relative to each other b. sarcomeres slide relative to each other c. troponin and tropomyosin slide relative to each other d. muscle fibers slide past each otherarrow_forwardSkeletal muscle cells are a. large multinucleate cells that arise by growth. b. large multinucleate cells that arise by fusion of smaller cells. c. small cells connected by many gap junctions. d. large cells with a single nucleus.arrow_forwardWhich of the following statements relating to smooth muscle is true? a. single-unit smooth muscles contract rhythmically due to gap junctions b. multi-unit smooth muscles are arranged like skeletal muscle motor units c. visceral smooth muscles exhibit spontaneous action potentials d. multi-unit smooth muscles exhibit graded contractions in response to neural stimuli e. all of the abovearrow_forward
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- Choose the best description of how myosin and actin are arranged within the two types of protein filaments in myofibrils. a.) Actin makes up the think filaments, and myosin makes up the thin filaments. b.) Myosin makes up the think filaments, and actin makes up the thin filaments. c.) Myosin and actin are randomly interspersed in the think filaments but are absent from the thin filaments. d.) Myosin and actin overlap with each other to make up both the think and thin filaments.arrow_forwardMark the following statements as true or false. If a statement is false, correct it to make a true statement. a. Muscle fibers generate more tension if the starting length of their sarcomeres is very short. b. Stimulation by a motor neuron before a muscle fiber has fully relaxed results in a condition called wave summation. c. Muscles that require a great deal of precise control will have large motor units. d. A muscle fiber changes length during isotonic concentric and isotonic eccentric contractionsarrow_forwardWhich of the following statements about the connective sheath of skeletal muscle is false? a. the endomysium wraps around every single muscle fiber b. the perimysium wraps around groups of muscle fibers c. the epimysium wraps around the whole muscle organ d. all of the above e. none of the abovearrow_forward
- Calmodulin is found in smooth muscle cells and performs a similar function to troponin in striated muscle fibers. However, calmodulin not only gets activated by Ca2+ but also slows the release of Ca2+ from the sarcoplasmic reticulum. How might this difference relate to the different kinds of contractions smooth muscles do in comparison to striated muscles?arrow_forwardWhich of the following characteristics does not apply to skeletal muscle tissue? a. striated b. voluntary c. multinucleated d. spindle shaped cells e. All of the above are correctarrow_forwardRigor mortis occurs following death because a. tropomyosin remains over the myosin binding sites of actin. b. myosin heads attach to actin and are not released due to lack of ATP. c. the myosin becomes misshapen. d. all of the Ca2+ remains within the sarcoplasmic reticulum.arrow_forward
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