A cardiovascular nurse is orienting a new nurse to the unit. The ...

[ETearle]

A cardiovascular nurse is orienting a new nurse to the unit. The new nurse questions the steps of the normal cardiac conduction system. The senior nurse explains that action potentials in the myocardium follow which sequence?
 
  1. Sinoatrial (SA) node, internodal pathway, atrioventricular (AV) node, bundle of His, and Purkinje fibers
  2. Internodal pathway, sinoatrial (SA) node, atrioventricular (AV) node, and Purkinje fibers
  3. Atrioventricular (AV) node, sinoatrial (SA) node, bundle of His, and internodal pathway
  4. Purkinje fibers, bundle of His, atrioventricular (AV) node, internodal pathway, and sinoatrial (SA) node

Question 2

The nurse knows that the SA node generates a new action potential approximately __ times per minute under resting conditions.
 
  Standard Text: Round answer to the nearest whole number.
  What will be an ideal response?

[bfulkerson77]

Answer to Question 1

Correct Answer: 1
Rationale 1: This is the normal conduction pathway through the myocardium.
Rationale 2: This is an incorrect sequence of conduction through the myocardium.
Rationale 3: This is an incorrect sequence of conduction through the myocardium.
Rationale 4: This is an incorrect sequence of conduction through the myocardium.
Global Rationale: Sinoatrial (SA) node, internodal pathway, atrioventricular (AV) node, bundle of His, and Purkinje fibers is the normal conduction pathway through the myocardium. The other sequences are incorrect.

Answer to Question 2

Correct Answer: 75
Rationale: The SA node generates a new action potential approximately 75 times per minute under resting conditions. This is known as a normal sinus rhythm.
Global Rationale: The SA node generates a new action potential approximately 75 times per minute under resting conditions. This is known as a normal sinus rhythm.

[ETearle]

TY

[bfulkerson77]

You're welcome