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Author Question: Which letter in the figure identifies the cardiac cells through which there is a 100-ms delay? a. ... (Read 11 times)

kamilo84

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on: Jul 16, 2018
Which letter in the figure identifies the cardiac cells through which there is a 100-ms delay?
 
  a. A c. C
  b. B d. D

Question 2

The fourth intercostal space at the left sternal margin is the site for which of the following elec-trocardiogram leads?
 
  a. V1 c. V3
  b. V2 d. V4


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mtmmmmmk

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: D
As the electrical impulse travels through the atrioventricular node, there is a 100-ms delay in the conduction. This allows the atria to become fully depolarized and contract before ventricular ex-citation begins. This allows the atrial contraction and emptying to contribute optimally to ventric-ular filling.

Answer to Question 2

ANS: B
V2 is placed in the fourth intercostal space, at the right sterna margin.


kamilo84

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Reply #2 on: Jul 16, 2018
Correct answers!


mtmmmmmk

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Reply #3 on: Jul 16, 2018
Great! Please up vote :D


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