This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why is the electrical impulse temporarily delayed at the atrioventricular (AV) node? a. To allow ... (Read 42 times)

ahriuashd

  • Hero Member
  • *****
  • Posts: 535
on: Jul 16, 2018
Why is the electrical impulse temporarily delayed at the atrioventricular (AV) node?
 
  a. To allow complete emptying of the ventri-cles
  b. To allow more sodium buildup in the my-ocardial cells
  c. To allow better filling of the ventricles
  d. To allow complete filling of the atria

Question 2

What structure serves as the backup pacemaker for the heart?
 
  a. Atrioventricular (AV) node
  b. Sinoatrial (SA) node
  c. Bundle of His
  d. Purkinje fibers


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cdmart10

  • Sr. Member
  • ****
  • Posts: 332
Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: C
The impulse is temporarily delayed at the AV node in order to allow the ventricles time to fill with blood. That brief delay also limits the rate of the ventricular stimulation during excessively fast atrial rhythms that, if passed to the ventricles, would lead to inadequate cardiac output.

Answer to Question 2

ANS: A
After leaving the atria, the impulse moves to the AV node, located in the intraventricular septum in the inferior aspect of the right atrium (Figure 18-2). The AV node is the backup pacemaker because it has the second greatest degree of automaticity in the healthy heart.


ahriuashd

  • Member
  • Posts: 535
Reply 2 on: Jul 16, 2018
Great answer, keep it coming :)

frankwu0507

  • Member
  • Posts: 322
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Did you know?

More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

Did you know?

The FDA recognizes 118 routes of administration.

Electrical and chemical gradients. Electrical and chemical gradients.
Electroencephalography (EEG). To perform the EEG, electrodes attached to the patient’s head pick up Electroencephalography (EEG). To perform the EEG, electrodes attached to the patient’s head pick up
Relationship of the electrocardiogram to electrical conduction in the heart. Relationship of the electrocardiogram to electrical conduction in the heart.
To help make good electrical contact with the terminals without doing any harm, select the ... To help make good electrical contact with the terminals without doing any harm, select the ...
Structure of a Lymph Node Structure of a Lymph Node
My question is relating to impulse problems. My question is relating to impulse problems.
Video: Semidiscontinuous DNA replication

For a complete list of videos, visit our video library