871. Caveolae in smooth muscle cells are thought to be analogous to
A. lysosomes
B. secretory vesicles
C. T-tubules
D. pinocytotic vesicles
E. phagosomes

872. The thick filaments of skeletal muscle fibers
A. consist of both actin and myosin
B. are present in the A band
C. consist of actin
D. are crossed by the Z line
E. are present in the I bands

873. The contractile element (component) of skeletal muscle is in the
A. myofibrils
B. sarcoplasmic reticulum
C. sarcolemma
D. endomysium
E. sarcoplasm

874. The connective tissue investment seen with the light microscope around an individualmuscle fiber of skeletal muscle is
A. endomysium
B. epimysium
C. sarcolemma
D. perimysium
E. basal lamina

875. A node of Ranvier is
A. the point of near-contact between the processes of two neurons
B. characteristic of unmyelinated fibers
C. a constriction of the axon
D. a nerve receptor
E. a junction between two Schwann cells

876. Most of the nuclei seen in a cross section of a peripheral nerve belong to
A. microglia
B. neurons
C. Schwann cells
D. Fibroblasts
E. satellite cells

877. Pacinian corpuscles usually are considered to be most responsive to
A. light touch
B. pressure
C. Pain
D. heat
E. cold

878. The cells that are responsible for forming myelin in the central nervous system are the
A. Schwann cells
B. satellite cells
C. microglia
D. astroglia
E. oligodendroglia

879. Nissl substance in nerve cell bodies is associated with
A. spread of stimulus
B. synaptic junctions
C. axons
D. protein synthesis
E. myelin formation

880. A myelinated nerve has how many Schwann cells between two adjacent nodes of Ranvier?
A. one
B. two
C. three
D. Four
E. more than four

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