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Chapter 10: Muscle Tissue

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

a. Perimysium

b. Epimysium

c. Fascia

d. Endomysium

e. Sarcoplasmic reticulum

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?

a. Attachment sites for thick myofilaments

b. Sites for calcium sequestration and release

c. Sites for impulse conduction into the fiber

d. Sites for ATP production

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

Which characteristic is unique to cardiac muscle?

a. Contain centrally located nuclei

b. Striated

c. Often branched

d. Multinucleated

e. Lack T-tubules

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

a. Actin

b. Calmodulin

c. Desmin

d. Myosin light chain kinase

e. Tropomyosin

Which feature typifies T-tubules?

a. Evaginations of the sarcoplasmic reticulum

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

c. Carry depolarization to the muscle fiber interior

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

e. Rich supply of acetylcholine receptors

Which characteristic is unique to smooth muscle?

a. T-tubules lie across Z lines

b. Each thick filament is surrounded by six thin filaments

c. Thin filaments attach to dense bodies

d. Cells are multinucleated

e. Cells have centrally located nuclei

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

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