The terms petechiae, purpura, and ecchymoses all describe:
a. Varying degrees of thrombocytopenia
b. Varying degrees of thrombocythemia
c. Varying qualitative platelet disorders
d. Varying size hemorrhages into the skin because of small-vessel bleeding
ANS: D
These terms all refer to small-vessel bleeding into the skin that is caused by thrombocytopenia or many of the qualitative platelet disorders. Petechiae are small pinpoint hemorrhages, purpura are about 1 cm in diameter, whereas ecchymoses are 3 cm or larger.
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Indicate whether this statement is true or false.
When a cell becomes stimulated (excited) ________
A) the interior of the neuron becomes more negative B) sodium gates in the cell membrane spring open C) the entire neuron remains at rest D) sodium gates in the cell membrane close