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

Author Question: A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker ... (Read 59 times)

fnuegbu

  • Hero Member
  • *****
  • Posts: 539
on: Jun 25, 2018
A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker cells of the heart. Which of the following areas received the greatest damage?
 
  a. Atrioventricular (AV) node
  b. Sinoatrial (SA) node
  c. Bundle of His
  d. Ventricles

Question 2

A 28-year-old with seizure disorder has a vagus nerve stimulator implanted to help control sei-zure activity. Which result will the nurse expect to occur?
 
  a. Increased speed of cardiac cycle
  b. Increased cardiac contractility
  c. Decreased vasodilation
  d. Decreased cardiac conduction


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Dominic

  • Sr. Member
  • ****
  • Posts: 328
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
The SA node, not the AV node, is considered the pacemaker of the heart. Neither the bundle of His nor the ventricles are involved.

Answer to Question 2

ANS: D
The vagus nerve releases acetylcholine. Acetylcholine causes decreased heart rate and slows conduction through the AV node, thus decreasing the speed of the cardiac cycle. This reaction also decreases contractility but does not cause decreased vasodilation.


fnuegbu

  • Member
  • Posts: 539
Reply 2 on: Jun 25, 2018
Great answer, keep it coming :)

emsimon14

  • Member
  • Posts: 344
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

Did you know?

Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Did you know?

Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th Changes in boreal forest composition along a chronosequence in Quebec. Dates refer to the year of th
Chest Configurations, Normal Adult, Barrel Chest, Pectus Carinatum, Pectus Excavatum Chest Configurations, Normal Adult, Barrel Chest, Pectus Carinatum, Pectus Excavatum
Forms of primary adult glaucoma: (a) in chronic open-angle glaucoma, the anterior chamber angle rema Forms of primary adult glaucoma: (a) in chronic open-angle glaucoma, the anterior chamber angle rema
Blisters caused by HSV-1. Blisters caused by HSV-1.
Flail chest (Part 1) Flail chest (Part 1)
A non-interest-bearing five-year note for $54600.00 issued May 1, 2015, is discounted April 1, ... A non-interest-bearing five-year note for $54600.00 issued May 1, 2015, is discounted April 1, ...
Video: Premenstrual Syndrome

For a complete list of videos, visit our video library