The nurse explains how the myocardium receives oxygen to the new ...

[nautica902]

The nurse explains how the myocardium receives oxygen to the new graduate nurse beginning work in the constant care unit; she tells the new nurse the coronary arteries receive blood when?
 
  A) During diastole
  B) During systole
  C) When the heart is refractory
  D) When the aortic valve is open

Question 2

A patient diagnosed with myasthenia gravis is having trouble swallowing. What anticholinesterase inhibitor would be the drug of choice for this patient?
 
  A) Galantamine
  B) Pyridostigmine
  C) Donepezil
  D) Bethanechol

[jointhecircus]

Answer to Question 1

A
Feedback:
The coronary arteries receive blood during diastole, when the muscle is at rest and relaxed so that blood can flow freely into the muscle. When the ventricle contracts, it forces the aortic valve open, which in turn causes the leaflets of the valve to cover the openings of the coronary arteries.

Answer to Question 2

B
Feedback:
Pyridostigmine is preferred in some cases for the management of myasthenia gravis because it does not need to be taken as frequently and can be given parenterally for patients who are having difficulty swallowing. Galantamine and bethanechol cannot be given parenterally to the patient having difficulty swallowing. Donepezil is not indicated for the treatment of myasthenia gravis but is used to manage Alzheimer dementia, including severe dementia.

[nautica902]

Thanks

[jointhecircus]

Welcome