Which of These Statements Correctly Describes Action Potentials in the Heart

question 130

Multiple Choice

Which of these statements correctly describes action potentials in the heart?

• 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 rapid Ca²⁺ 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:

Preoperational

A stage in Jean Piaget’s theory of cognitive development where children from about 2 to 7 years old engage in symbolic play but lack operations (logical rules) for consistent reasoning.

Concrete Operational

A stage in Piaget's theory of cognitive development where children (ages 7-11) can think logically about concrete events.

Formal-Operational

Formal-operational stage is a phase in Piaget's theory of cognitive development when individuals gain the ability to think abstractly, logically, and systematically.

Intuitive Stage

A stage in Piaget's theory of cognitive development, occurring roughly between the ages of 4 and 7, where children start using intuition and perception but lack logical reasoning.