Neurons in the cns have less chance of regenerating for all of the following reasons except:
a. there is no neurolemma in cells of the cns
b. astrocytes fill in the path of regrowth
c. microglia lay down scar tissue.
d. all of these lessen the chance of healing in the cns.

Conrad jackson is a 28-year-old man who presents to the emergency department with severe fatigue and dehydration secondary to a 4-day history of vomiting. during the interview, he describes attending a family reunion and states that perhaps he "ate something bad". upon admission his vital signs are a temperature of 102.7 f, heart rate of 116 bpm, respiratory rate of 18 breaths/min, and blood pressure of 86/54 mm hg. the nurse also notes the patient has dry mucuos membranes and tenting of skin. the physician orders an iv to be started with 0.45% normal saline, and orders a serum electrolytes and an arterial blood gas. the following results are returned from the laboratory: sodium (na+) 150 potassium (k+) 5.5 chloride (cl-) 110 bun 42 creatinine 0.8 glucose 86 ph 7.32 paco2 35 hco3 20 pao2 90 o2sat 98% a. what is your interpretation of this arterial blood gas sample? b. explain the high potassium in this patient. c. calculate the patient's anion gap: d. what is the interpretation of this anion gap?