Author Question: Which of the following preoperative teaching points related to corneal transplantation is most ... (Read 76 times)

Chloeellawright · **on:** Jun 25, 2018

Which of the following preoperative teaching points related to corneal transplantation is most justified?

A)
You should know that there is a significant risk that your body will reject the transplant.
B)
The cornea is highly vascular, and therefore you will be at risk for hemorrhage.
C)
Your new cornea would come from someone who has recently died.
D)
You run a risk of developing a major inflammatory response post-op and will need frequent follow-up appointments.

Question 2

A student notices that at certain times during his studying for final exams, he is more awake and his ability to think at a higher level is happening easier.

The nurse knows that this experience may be attributed to which of the following neurological functions?
A)
Release of excitatory neurotransmitters such as glutamate
B)
Release of GABA, an inhibitory neurotransmitter
C)
Release of corticotrophin-releasing hormone
D)
Heightened precortex processes

mk6555 · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

Ans:
C

Feedback:

Advances in ophthalmologic surgery permit corneal transplantation using a cadaver cornea. The low rejection rate is due to several factors: the cornea is avascular, which limits perfusion by immune elements; major histocompatibility complexes are virtually absent in the cornea; antigen-presenting cells are not present in great numbers; the cornea secretes immunosuppressive factors; and corneal cells secrete substances that protect against apoptosis, thereby minimizing inflammation.

Answer to Question 2

Ans:
A

Feedback:

Excitatory neurotransmitters such as glutamate increase the probability that the target cell will fire an action potential by mediating the depolarization of the target cell. Excitatory transmitters serve as the body's stimulants promoting wakefulness, energy, and activity through regulating many of the body's most basic functions, including thought processes, higher thinking, and sympathetic activity. Distracters B, C, and D do not play a role in this process.