Nokea
The waxy substance that covers the neuron fibers and increases the rate of transmission of impulses is the ___
Correct Answer: myelin
Rationale: Myelin is the waxy substance that covers the neuron fibers (axons and dendrites) and increases the rate of transmission of impulses.
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Which issue is the basic problem that prompts most of the early signs of Alzheimer's disease (AD)?
- A. Changes in mood
- B. Misplacing things
- C. Memory loss that disrupts daily life
- D. Problems with words in speaking
Correct Answer: C
Rationale: Memory loss that disrupts daily life is the basic problem that prompts most of the early signs of AD.
For which reason is a 'drug holiday' used in the treatment of Parkinson disease?
- A. Change all drugs.
- B. Allow the natural dopamine levels to rise.
- C. Restart drugs at a lower dosage with favorable results.
- D. Reduce the extrapyramidal symptoms.
Correct Answer: C
Rationale: A 'drug holiday' is a period when all drugs are withdrawn from the person with Parkinson disease. The drugs are then restarted at a lower dose with favorable results.
Following a myelogram the nurse will include in the postprocedure care observing for which possible complication?
- A. elevation of blood pressure.
- B. urine retention.
- C. Loss of sensation in lower extremities.
- D. slurred speech.
Correct Answer: C
Rationale: Postmyelogram care includes the data collection to ensure there is no leakage of CSF, sensation and strength of the lower extremities, or headache. To avoid a headache, the patient should be flat for a few hours.
___ is/are responsible for the transmission of impulses between synapses.
Correct Answer: Neurotransmitters
Rationale: Neurotransmitters (acetylcholine, norepinephrine, dopamine, and serotonin) function to conduct transmission between the synapses.
What are surgical navigational systems?
- A. Computerized devices that guide the surgeon
- B. A set of detailed anatomic maps pinpointing specific areas of the brain
- C. A written set of progressive processes for the resection of small brain tumors
- D. The use of radioactive materials to pinpoint small tumors of the brain
Correct Answer: A
Rationale: Surgical navigational systems are computerized devices that guide the surgeon and make possible the resection of tumors that were once thought to be inoperable.