Hypernatremia is a plasma ________ concentration above normal
A) Pi B) Ca2+ C) Na+ D) Cl- E) K+
C
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The amount of CSF within the brain at any given moment is approximately
A. 600 ml. B. 1,200 ml. C. 130 ml. D. 12 ml. E. 4,800 ml.
Which of the following is NOT true of the white matter of the spinal cord?
A. Some of the white matter tracts decussate to the opposite side, either in the spinal cord or in the brainstem. B. The white matter surrounds the gray matter in the spinal cord. C. The white matter is located in columns. D. The ascending tracts of the white matter contain motor neurons. E. All of these are true of the white matter of the spinal cord.
At an excitatory chemical synapse between two neurons
A. there is increased permeability of the postsynaptic cell to both Na+ and K+. B. an action potential in the presynaptic neuron always causes an action potential in the postsynaptic neuron. C. a small hyperpolarization of the postsynaptic membrane occurs when the synapse is activated. D. excitation occurs because K+ enters the postsynaptic cell. E. action potentials spread through gap junctions between cells.
The function of a bursa is to
A. produce fluid. B. increase the articulating surface at a joint. C. provide a fluid-filled cushion that reduces friction. D. provide support for a weak joint. E. bind ligaments to bones.