An excitatory postsynaptic potential lasts for about
A. 15 seconds.
B. 15 microseconds.
C. 15 milliseconds.
D. 15 minutes.
Answer: C
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Sinoatrial node cells
A. exhibit spontaneous depolarization that is speeded by activation of their beta-adrenergic receptors. B. reach threshold only when action potentials generated by the AV node arrive through gap junctions. C. are between atrial muscle cells and cells of the bundle of His. D. exhibit spontaneous depolarization that is speeded by activation of their cholinergic receptors. E. exhibit a steep upstroke due to the presence of the same type of Na+ channels found in neuronal membranes.
Stan takes vitamin supplements every day, buying whatever is on sale at the health food store. He develops nausea, headache, fatigue, easy bruising, and bleeding. Which vitamin is he likely taking in excess?
A. B12 B. E C. D D. C
The epigastric region is ________ to the right hypochondriac region of the abdominopelvic cavity
A) medial B) superior C) dorsal D) lateral
How is the length of a skeletal muscle cell related to the force it can generate?
A. The tension in a skeletal muscle cell is greatest when contractions occur at either very short or very long lengths. B. Skeletal muscle cells generate the same amount of force, regardless of their length. C. The shorter a skeletal muscle cell is when it begins to contract, the stronger the force generation will be. D. The longer a skeletal muscle cell is when it begins to contract, the stronger the force generation will be. E. Skeletal muscle cells generate the most force when the contraction occurs at an intermediate length.