Calcium channel blockers are frequently used to
A. increase the heart rate.
B. treat tachycardia or other arrhythmias.
C. speed up conduction of impulses through the AV node.
D. slow the closing of potassium ion channels.
E. treat bradycardia and low blood pressure.
B
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When a single presynaptic neuron repeatedly releases neurotransmitter in a very short period of time, it results in ____________ summation in the postsynaptic neuron
Fill in the blank with correct word.
The part of the skin at the bottom of the picture, seen in a lighter shade of gray, is the
A) strata. B) carotene. C) dermis. D) cornified region. E) hypodermis
Tight junctions
a. prevent passage of materials into epithelial cells b. force materials to pass between cells c. are commonly found in digestive tract linings d. comprise part of the glycocalyx e. consist of cadherin proteins
The intestinal response to PTH secretion when calcium ion levels are low is that calcium is
A) released. B) excreted. C) conserved. D) absorbed quickly. E) absorbed slowly.