A patient presents with muscle weakness, and upon examination, you suspect a disorder affecting the neuromuscular junction. Which condition is most likely responsible for these symptoms?
Fibromyalgia
Muscular dystrophy
Polymyositis
Myasthenia gravis
The Correct Answer is D
A. Fibromyalgia: Fibromyalgia is a chronic pain syndrome characterized by widespread musculoskeletal pain and fatigue, not a primary disorder of the neuromuscular junction.
B. Muscular dystrophy: Muscular dystrophy represents genetic disorders causing progressive muscle fiber degeneration rather than a problem at the neuromuscular junction.
C. Polymyositis: Polymyositis is an inflammatory myopathy causing proximal muscle weakness due to muscle inflammation, not a junctional transmission defect.
D. Myasthenia gravis: Myasthenia gravis is an autoimmune disorder that impairs acetylcholine receptor function at the neuromuscular junction, producing fluctuating muscle weakness and fatigability.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Osteoblasts; osteopetrosis:Osteoblasts build bone matrix and excessive activity leads to denser bone, not osteopetrosis, which involves defective bone resorption.
B. Osteoclasts; osteoporosis:Osteoclasts break down bone tissue during remodeling; when their activity outweighs bone formation, it can result in osteoporosis due to bone loss.
C. Osteocytes; osteoporosis:Osteocytes maintain the bone matrix and act as mechanosensors but do not perform resorption that causes bone thinning.
D. Chondrocytes; osteoarthritis:Chondrocytes maintain cartilage tissue, and their degeneration contributes to osteoarthritis rather than affecting bone resorption.
Correct Answer is D
Explanation
A. Iron:Iron is essential for hemoglobin and oxygen transport, not a primary structural bone mineral.
B. Sodium: Sodium is an extracellular electrolyte important for fluid balance and nerve function, not bone hardness.
C. Potassium: Potassium is an intracellular electrolyte important for cell function, not the main bone mineral.
D. Calcium: Calcium (along with phosphate in hydroxyapatite) is the primary mineral that gives bone its hardness and compressive strength.
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