Which Statement Concerning Action Potentials in the Heart Is Correct

question 12

Multiple Choice

Which statement concerning action potentials in the heart is correct?

• A) The rising phase of the action potential in cardiac autorhythmic cells is due to a rapid Ca²⁺ influx.
• B) The rising phase of the action potential in cardiac contractile cells is due to a rapid K⁺ influx.
• C) The plateau phase of the action potential in cardiac contractile cells is due to a rapidCa²⁺ influx.
• D) The plateau phase of the action potential in cardiac contractile cells is due to a rapid K⁺ influx.

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Definitions:

Logic Continuity

The principle that ensures a logical flow or sequence is maintained throughout a control program or system.

Ladder Diagram

A visual programming language that mimics a ladder's rungs, utilized for the programming of Programmable Logic Controllers (PLCs).

Horizontal Line

A straight line that runs left to right across a plane or surface, parallel to the horizon.

Rung

A horizontal line of instructions or a command sequence in ladder logic programming used in PLC systems.