A nurse is reading a chart and sees the term oncotic pressure. The nurse recalls that oncotic pres-sure (colloid osmotic pressure) is determined by:
a. the concentration of sodium.
b. plasma proteins.
c. hydrostatic pressure.
d. the availability of membrane transporter proteins.
ANS: B
Oncotic pressure is determined by the effect of colloids or plasma proteins. The concentration of sodium plays a role in tonicity. Hydrostatic pressure is the force within a vessel. Membrane transporter proteins are involved in active transport within a concentration gradient.
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