Hemophilia results from
a. a deficiency of platelets
b. inadequate hemoglobin production
c. vitamin B12 deficiency
d. an inability to produce one of the factors in the clotting cascade
e. excess production of heparin
D
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At an excitatory synapse, an action potential in the presynaptic neuron increases
a. the membrane potential of the postsynaptic cell membrane b. the permeability of the postsynaptic cell to Na+ c. the permeability of the postsynaptic cell to Cl- d. the presynaptic neuron's membrane potential e. all of the above
Substance A, a penetrating solute, crosses the membrane at a rate of 10 molecules per second. When a patient has a fever and body temperature is elevated, we would expect the cell to have a rate of
A. less than 10 molecules per second. B. more than 10 molecules per second. C. 10 molecules per second.
Which of the following descriptions of glial cells is mismatched?
A. Astrocytes - blood-brain barrier B. Microglia - provide support for the neuron cell body C. Ependymal cells - produce cerebrospinal fluid D. Oligodendrocytes - form myelin sheaths E. Ependymal cells - choroid plexus
The vocal cords are located in the ________
A) Larynx B) Oropharynx C) Nasal cavity D) Laryngopharynx