A chemical buffer system is a pair of chemical compounds involved in a reversible reaction, one that can yield free ____________________ and one that can bind free ____________________, which together minimize changes in ____________________ when either an acid or a base is added to or removed from the solution
Fill in the blank(s) with correct word
H+, H+, pH
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Each of the following nerves originates in the lumbar plexus except the ________ nerve
A) saphenous B) sciatic C) femoral D) obturator E) genitofemoral
The purpose of the two small muscles, the tensor tympani and the stapedius, in the ear is to
-reduce damage to the earbones. -protect the tympanic membrane. -contract quickly when there is a loud sound. -move the ossicles. -All of the answers are correct
At rest, active sites on the actin are blocked by
A) myosin molecules. B) troponin molecules. C) tropomyosin molecules. D) calcium ions. E) ATP molecules.
Synthesized by the combined action of the skin, kidneys, and liver, ________ is important to the deposition of bone.
A. growth hormone B. estrogen C. testosterone D. calcitonin E. calcitriol