Elastic arteries function as
a) vasodilators.
b) conduits to the tissues of the trunk only.
c) barriers to microcirculation.
d) pressure reservoirs.
e) vasoconstrictors.
d
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The binding of ATP to myosin causes an allosteric change in myosin's actin-binding site such that the affinity of myosin for actin is decreased.
Answer the following statement true (T) or false (F)
A cation that is essential for muscle contraction, nerve function, and blood clotting is
A) sodium. B) potassium. C) calcium. D) magnesium. E) selenium.
Match the stage of interphase with the event(s) that occur(s): G1
A)The cell permanently stops dividing. B)DNA replicates. C)The cell is metabolically active, synthesizing proteins, and growing rapidly. D)Cell division enzymes are synthesized, and the centrioles complete replication.
A young man was assaulted and has extensive maxillofacial injuries. Your primary assessment reveals that he is semiconscious, has shallow breathing, and has blood draining from the corner of his mouth. Initial management for this patient involves:
A) inserting an oropharyngeal airway, preoxygenating him with a bag-mask device for 2 minutes, and then intubating his trachea. B) applying a cervical collar, performing a blind finger sweep to clear his airway, and providing ventilatory assistance with a bag-mask device. C) fully immobilizing his spine, inserting a nasopharyngeal airway, and hyperventilating him with a bag-mask device at a rate of 20 breaths/min. D) manually stabilizing his head in a neutral position, suctioning his oropharynx, and assisting ventilations with a bag-mask device and 100% oxygen.