When a Pacemaker Potential in the SA Node Reaches Threshold

question 155

Multiple Choice

When a pacemaker potential in the SA node reaches threshold,

• A) the permeability to K⁺ increases.
• B) many voltage-gated Ca²⁺ channels open.
• C) voltage-gated Ca²⁺ channels close.
• D) resting membrane potential has been restored.
• E) permeability of the cell does not change.

Understand the role of audience perception and compliance expectation in crafting routine requests.

Grasp the importance and application of being specific and clear when asking questions within a routine request.

Identify the elements of a courteous close in a routine request.

Comprehend the strategies for stating the request effectively and efficiently.

---

Definitions:

Preoperational

A stage in Piaget's theory of cognitive development, occurring from approximately 2 to 7 years of age, characterized by symbolic thought but not yet capable of logical operations.

Second-Order Operations

Second-order operations refer to the ability to think about thoughts themselves, involving complex cognitive processes like reflection and abstraction, often developing during adolescence.

Abstract Operations

A stage of cognitive development according to Piaget, characterized by the ability to think logically about abstract concepts and hypothetical situations.

Concrete Operations

A stage in cognitive development, as described by Piaget, where children gain the ability to think logically about concrete, tangible objects and events.