Which of the Following Statements Is True Concerning the Diastolic

question 126

Multiple Choice

Which of the following statements is true concerning the diastolic depolarization phase of a cell in the SA node?

• A) The cell will not depolarize until it receives sympathetic stimulation.
• B) The pacemaker potential is caused by Ca²⁺ entering the cell via L-type Ca²⁺ channels.
• C) The pacemaker potential is slower in achieving threshold when acetylcholine is applied to the SA node cells.
• D) During diastolic depolarization, there is a gradually increasing permeability to K⁺.
• E) The slope of the diastolic depolarization is decreased when norepinephrine is applied to the SA node cells.

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