Scientists recently discovered a possible new route for direct exchange of materials between cells: ____
a. piggy back molecules
b. tunneling nanotubes
c. microcrystals
d. protein carriers
e. lipid bridges
b
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The respiratory membrane consists of
A) two thicknesses of epithelial cells and basement membranes. B) two thicknesses of epithelial cells. C) a single thickness of epithelial cells. D) a single thickness of epithelial cells and a basement membrane.
H+ generated from CO2 at the tissue level is
a. the major source of hydrogen ion in the body b. normally buffered in transit between the tissues and the lungs by hemoglobin c. responsible for the pH of venous blood being higher than the pH of arterial blood d. both a and b e. all of the above
Efferent lymphatics exit the lymph node at the ____, a slight depression on one side
a. hilum b. trabecula c. sinus d. lacteal
A drug that inhibits angiotensin-converting enzyme (ACE) may lead to:
A) decreased blood pressure. B) increased blood volume. C) increased secretion of aldosterone. D) increased sodium reabsorption.