A woman with severe visual and auditory deficits is able to ...

[luvbio]

A woman with severe visual and auditory deficits is able to identify individuals by running her fingers lightly over their face. Which of the following sources is most likely to provide the input that allows for the woman's unique ability?
 
  A)
  Pacinian corpuscles
  B)
  Ruffini end organs
  C)
  Meissner corpuscles
  D)
  Free nerve endings

Question 2

While assessing a critically ill patient in the emergency department, the nurse notes on the cardiac monitor an R-on-T premature ventricular beat that develops into ventricular tachycardia (VT).
 
  Immediately, the patient became unresponsive. The nurse knows that based on pathophysiologic principles, the most likely cause of the unresponsiveness is
  A)
  metabolic acidosis that occurs spontaneously following any dysrhythmias.
  B)
  interruption of the blood/oxygen supply to the brain.
  C)
  massive cerebrovascular accident (CVA) resulting from increased perfusion.
  D)
  a blood clot coming from the heart and occluding the carotid arteries.

[Liddy]

Answer to Question 1

Ans:
C

Feedback:

Meissner corpuscles, which are present on the hair-free areas like palms and fingers, are responsible for fine tactile sensation. Pacinian corpuscles provide input on vibration, while Ruffini end organs exist in deeper structures that signal continuous states of deformation. Free nerve endings also detect touch and pressure, but not to the highly differentiated degree of Meissner corpuscles.

Answer to Question 2

Ans:
B

Feedback:

The brain receives 15 to 20 of the total resting cardiac output and consumes 20 of its oxygen. The brain cannot store oxygen or engage in anaerobic metabolism. An interruption of blood or oxygen supply to the brain rapidly leads to clinically observable signs and symptoms. Unconsciousness occurs almost simultaneously with cardiac arrest. Metabolic acidosis will occur later in the cardiac arrest but not immediately and is not responsible for the patient's unresponsiveness. CVAs can be caused by thrombosis formation or plaque occlusions, but it is not the primary reason for unconsciousness in VT.

[luvbio]

Thank you

[Liddy]

Happy to help you