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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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.
At the equilibrium potential for an ion, its ____________________ gradient is exactly counterbalanced by its electrical gradient
Fill in the blank(s) with correct word
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
Blockage of the common hepatic duct would interfere with digestion of
A) proteins. B) fats. C) disaccharides. D) complex carbohydrates. E) vitamins.