The nurse takes the patient's pulse and finds a regular rate at ...

[jon_i]

The nurse takes the patient's pulse and finds a regular rate at 44 beats/min. What area of the heart is controlling this patient's heart rate?
 
  A) The atrioventricular (AV) node
  B) The bundle of His
  C) The Purkinje fibers
  D) The sinuatrial (SA) node

Question 2

The mother of a child diagnosed with attention-deficit syndrome receives a prescription for a central nervous system (CNS) stimulant to treat her child.
 
  The mother asks the nurse, I don't understand why we're giving a stimulant to calm him down? What is the nurse's best response to this mother? A) It helps the reticular activating system (RAS), a part of the brain, to be more selective in response to incoming stimuli.
  B) It helps energize the child so they use up all of their available energy and then they can focus on quieter stimuli.
  C) No one truly understands why it works but it has been demonstrated to be very effective in treating ADHD.
  D) The drugs work really well and you will see a tremendous change in your child within a few weeks without any other treatment.

[johnharpe]

Answer to Question 1

D
Feedback:
The SA node generates an impulse about 90 to 100 times a minute, the AV node about 40 to 50 times a minute, and the complex ventricular muscle cells only about 10 to 20 times a minute.

Answer to Question 2

A
Feedback:
The paradoxical effect of calming hyperexcitability through CNS stimulation seen in attention-deficit syndrome is believed to be related to increased stimulation of an immature RAS, which leads to the ability to be more selective in response to incoming stimuli. CNS stimulants do not cause the child to use all his energy, the effect is thought to be understood, and telling the mother the drug just works without any explanation is not appropriate and may result in noncompliance with pharmacology therapy if the mother does not understand why the drug is given.

[jon_i]

Both answers were spot on, thank you once again

[johnharpe]

Great! Please up vote