All of the following are paranasal sinuses except the:
a. frontal sinus
b. maxillary sinus
c. sphenoid sinus
d. mandibular sinus
d. mandibular sinus
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The parts of a protein that change when it denatures are
A. the primary and secondary structures. B. the secondary and tertiary structures. C. the tertiary and quaternary structures. D. the amino acid sequence and the secondary structure.
Until it leaves the body, urine is held by the:
a. urethra b. urinary bladder c. ureter d. nephron
According to Fick's law of diffusion, which of the following changes would decrease the rate of net diffusion of a substance across a membrane?
a. an increase in the substance's concentration gradient b. an increase in the permeability of the membrane to the substance c. an increase in the surface area of the membrane d. an increase in the thickness of the membrane e. none of these answers.
Aldosterone exerts its effect on the kidney tubules by
A. increasing tubular renin production. B. increasing tubular permeability. C. increasing osmosis into the tubule cells. D. increasing the synthesis of the transport proteins for sodium. E. decreasing tubular permeability.