The five vertebral regions are the cervical, thoracic, lumbar, sacral, and
A) medial.
B) proximal.
C) distal.
D) coccygeal.
E) os coxal.
D
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The __________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.
A. right atrioventricular B. left atrioventricular C. aortic D. pulmonary E. mitral
What is the first branch off of the aortic arch?
A) left common carotid artery B) right common carotid artery C) right subclavian artery D) brachiocephalic trunk
What second messenger most directly causes calcium ions to be released from intracellular stores?
A. diacylglycerol B. adenylyl cyclase C. inositol triphosphate D. phospholipase A E. phospholipase C
Which of the following events is NOT a characteristic of an action potential?
A. The plasma membrane becomes highly permeable to sodium ions and depolarization results. B. As sodium ions enter, the inside of the plasma membrane becomes more negative. C. At the peak of depolarization, sodium channels begin to close and potassium channels open. D. In repolarization, potassium ions flow out of the cell. E. Action potentials occur according to the all-or-none principle.