A neuron branching from the spinal cord innervates a group of muscle fibers in the biceps brachii and stimulates them to contract. This neuron is part of the ________ pathway.
Fill in the blank(s) with the appropriate word(s).
efferent
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If a patient becomes dehydrated, the percentage of plasma in a centrifuged sample of his or her blood would likely
A. decrease. B. increase. C. not change.
Abnormal heart rhythms are called ________.
A. arrhythmias B. sinus rhythms C. bradycardias D. tachycardias
Which of the following statements is not true of the precapillary sphincters?
A) They decrease the osmotic pressure in the thoroughfare channel. B) They increase or decrease rates of perfusion to the tissues served by the true capillaries. C) They allow blood to bypass the true capillaries that are fed by the metarteriole. D) They regulate the flow of blood to tissues served by the true capillaries.
Why is it so difficult to determine the phylogenetic relationships of turtles to other sauropsids?
What will be an ideal response?