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Chapter 10: Muscle Tissue

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The basal lamina of a muscle fiber is part of which structure?

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a. Perimysium

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b. Epimysium

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c. Fascia

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d. Endomysium

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e. Sarcoplasmic reticulum

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With the transmission electron microscope skeletal muscle fibers can be seen to contain structures called triads. What do the two lateral components of a triad represent?

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a. Attachment sites for thick myofilaments

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b. Sites for calcium sequestration and release

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c. Sites for impulse conduction into the fiber

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d. Sites for ATP production

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e. Sites for synthesis of proteins to be secreted outside the cell

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Which characteristic is unique to cardiac muscle?

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a. Contain centrally located nuclei

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b. Striated

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c. Often branched

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d. Multinucleated

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e. Lack T-tubules

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In smooth muscle calcium released by the smooth ER initiates contraction by binding to what protein?

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a. Actin

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b. Calmodulin

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c. Desmin

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d. Myosin light chain kinase

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e. Tropomyosin

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Which feature typifies T-tubules?

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a. Evaginations of the sarcoplasmic reticulum

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b. Sequester calcium during muscle relaxation, releasing it during contraction

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c. Carry depolarization to the muscle fiber interior

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d. Overlie the A-I junction in cardiac muscle cells

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e. Rich supply of acetylcholine receptors

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Which characteristic is unique to smooth muscle?

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a. T-tubules lie across Z lines

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b. Each thick filament is surrounded by six thin filaments

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c. Thin filaments attach to dense bodies

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d. Cells are multinucleated

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e. Cells have centrally located nuclei

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In one type of muscle, numerous gap junctions, desmosomes, and ...

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