19. PET scan results indicate a tangled mass of nonfunctioning neurons replaced by senile plaques. Progress notes indicate deterioration of judgment, emotional detachment, and sleep disturbance.
The etiology is noted to be a genetic mutation. Which condition is reflected in this patient's record?
Parkinson disease
Senile dementia
Epileptic seizure
Alzheimer disease
The Correct Answer is D
Alzheimer disease is a progressive neurodegenerative disorder that affects memory, cognition, behavior, and daily functioning. Alzheimer disease is characterized by the accumulation of amyloid-beta plaques and neurofibrillary tangles in the brain, which impair the communication and survival of neurons. Alzheimer disease is influenced by genetic and environmental factors, and some rare forms of the disease are caused by mutations in specific genes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
More H and HCO3 form, decreasing the blood's pH.
Rationale: Hypoventilation is a condition where the breathing rate is too slow or shallow, resulting in insufficient removal of carbon dioxide (CO2) from the body. CO2 reacts with water (H2O) to form carbonic acid (H2CO3), which can dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-). Therefore, when CO2 accumulates in the blood due to hypoventilation, more H2CO3 is formed, which lowers the blood's pH by increasing the concentration of H+ and HCO3-.
Correct Answer is C
Explanation
The renin-angiotensin system (RAS) is a hormonal system that regulates blood pressure and fluid balance. When blood pressure is low, the kidneys secrete renin, which converts angiotensinogen into angiotensin I, which is then converted into angiotensin II by angiotensin-converting enzyme (ACE). Angiotensin II is a potent vasoconstrictor that narrows blood vessels and increases blood pressure. It also stimulates the release of aldosterone, which increases sodium and water retention and further raises blood pressure. When the RAS is overactivated, it can lead to a hypertensive crisis, which is a severe elevation of blood pressure that can damage organs and cause stroke, heart attack, or kidney failure.
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