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Posted: June 29th, 2022
FNU Pathophysiology Exam Complete
FNU Pathophysiology Exam Complete
FNU Pathophysiology Exam Complete
Question
Question 1
Which of the following statements describes phase 4 of the action
potential of cells in the sinoatrial (SA) node?
Answers:
A. Potassium permeability is allowing the cell membrane to
remain depolarized, and Ca2+ channel opens moving Ca2+ back
into the cell.
B. The cells are capable of responding to a greater than normal
stimulus before the resting membrane potential is reached.
C. A slow depolarization occurs when Na+ is transported out of the
cell and K+ moves back in, resulting in resting membrane
potential.
D. The fast sodium channels in the cellular membranes close,
causing an abrupt decrease in intracellular positivity.
Question 2
A 31-year-old woman with a congenital heart defect reports
episodes of light-headedness and syncope, with occasional
palpitations. A resting electrocardiogram reveals sinus
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