Impulse conduction is fastest in neurons that are _______
a. myelinated
b. unmyelinated
c. sensory
d. motor
e. cerebral
a. myelinated
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The periosteum is secured to the underlying bone by dense connective tissue called ________.
A) Volkmann's canals B) a bony matrix with hyaline cartilage C) perforating (Sharpey's) fibers D) the struts of bone known as spicules
What would result from a lack of extracellular Ca2+ at the neuromuscular junction?
A. Synaptic vesicles would fail to fuse and ACh would not be released. B. The neuron must use its intracellular Ca2+ to make the vesicles fuse. C. Potassium ions are used in place of Ca2+ to ensure the vesicles fuse. D. Nothing would happen because extracellular Ca2+ does not play a role in muscle stimulation. E. Excessive synaptic vesicles would fuse and release too much ACh, overstimulating the myofiber.
The trachea is ________ to the esophagus
A) anterior B) superior C) inferior D) dorsal E) posterior
Which cellular operation occurs in the smooth endoplasmic reticulum?
A) DNA replication leading to cell division B) synthesis of ribosomes via nucleoli C) synthesis of RNA D) manufacture of carbohydrates and lipids E) regulation of protein synthesis