When calcium becomes available inside a cell, it comes from
A) intracellular storage only.
B) extracellular fluid and intracellular storage.
C) extracellular fluid only.
D) It is always available as a major cytosol cation.
B) extracellular fluid and intracellular storage.
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At the equilibrium potential for an ion, its ____________________ gradient is exactly counterbalanced by its electrical gradient
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Which of the following muscles of facial expression inserts on the orbicularis oris, and compresses the cheeks when blowing air?
A. Zygomaticus major B. Platyma C. Buccinator D. Risorius E. Mentalis
A steroid hormone acts on a target cell by
A) causing a second messenger to be formed. B) promoting phagocytosis. C) causing the cell to divide. D) directly causing protein synthesis.
Blockage of the common hepatic duct would interfere with digestion of
A) proteins. B) fats. C) disaccharides. D) complex carbohydrates. E) vitamins.