If the sinoatrial (SA) node is damaged, the heart will likely beat at ________ bpm
A) 0 to 10 B) 10 to 20 C) 20 to 40 D) 40 to 50 E) 70 to 80
D
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If the sodium-potassium pumps in the plasma membrane fail to function, all of the following occur except
A) the intracellular concentration of potassium ions will increase. B) the neuron will slowly depolarize. C) the membrane will slowly lose its capacity to generate action potentials. D) the inside of the membrane will have a resting membrane potential that is more positive than normal. E) the intracellular concentration of sodium ions will increase.
What are the three functional classes of neurons in the nervous system?
a. afferent, efferent, and interneurons b. brain, spinal, and peripheral c. incoming, outgoing, and transitional d. efferent, spinal, and motor e. afferent, peripheral, and sensory
Before the large vitamin B12 molecule can be absorbed, it must be bound to __________.
a. vitamin C b. the gastric epithelium c. intrinsic factor d. another water-soluble vitamin
Which hormone(s) is released by cardiac muscle cells in response to increased atrial distension?
A) ADH B) aldosterone C) PTH D) acetylcholine E) natriuretic peptides