Which statement regarding the sinoatrial node is TRUE?
A. it is innervated by the vagal nerve
B. SA node reaches threshold faster than other heart structures
C. is located in the right atrial wall near the opening of the superior vena cava
D. it does not have a stable resting potential
E. all of the answers
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Which of the following correctly describes the reactive hypermia?
A. None of the answers
B. is the process in which blood flow is increased during changes in neuronal activity in the brain
C. is the process in which blood flow is drastically increased after a blockage (obstruction)
D. is the process in which blood flow is increased during muscle contraction
E. is the process in which blood flow is constant after a blockage (obstruction)