The lub-dup heart sounds heard during auscultation of the heart are associated with:
A. the SA node firing.
B. the heart valves opening.
C. the heart valves closing.
D. blood flowing from the atria to the ventricles.
Answer: C. the heart valves closing.
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Which sympathetic fibers form the splanchnic nerve?
A) those that synapse with parasympathetic fibers B) those that synapse in the same trunk ganglion they entered C) those that synapse with somatic fibers D) those that pass through the trunk ganglion to synapse in collateral or prevertebral ganglia
Anticodons, codons, and base triplets correspond to ________ respectively.
A. RNA, DNA, and pre-mRNA B. tRNA, DNA, and mRNA C. tRNA, mRNA, and DNA D. DNA, RNA, and pre-mRNA E. DNA, tRNA, and mRNA
When extreme temperature changes a protein's shape so much that it can no longer perform its usual function, that change is known as __________.
Fill in the blank with correct word.
This is a diagram of calcium homeostasis. What process is represented by "B"?
A. Calcium is lost in urine. B. Calcium is removed from blood by osteoblasts. C. PTH promotes calcium reabsorption from urine. D. Vitamin D promotes calcium absorption. E. PTH promotes calcium release into blood by osteoclast.