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 39 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
Wow, this really help

smrtceo

  • Member
  • Posts: 344
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

Coupling of electrical and mechanical activity in the mammalian heart. Coupling of electrical and mechanical activity in the mammalian heart.
Electric and butane-powered soldering guns used to make electrical repairs. Soldering guns are sold ... Electric and butane-powered soldering guns used to make electrical repairs. Soldering guns are sold ...
A typical module-controlled high-side driver (HSD) where the module itself supplies the electrical ... A typical module-controlled high-side driver (HSD) where the module itself supplies the electrical ...
The opening of the throttle plate can be delayed as long as 30 milliseconds (0.030 sec) to allow ... The opening of the throttle plate can be delayed as long as 30 milliseconds (0.030 sec) to allow ...
Lymph node structure. Lymph node structure.
My question is relating to impulse problems. My question is relating to impulse problems.
Video: Endocytosis -Types and Phagocytosis

For a complete list of videos, visit our video library