What does a positive Chvostek's sign indicate in the context of feedback loops?

• A. Hyperkalemia
• B. Hyponatremia
• C. Hypocalcemia
• D. Hypercalcemia

Answer: (C)

Verified step by step guidance

1. Understand that Chvostek's sign is a clinical test used to assess neuromuscular excitability, often related to calcium levels in the body.
2. Recognize that a positive Chvostek's sign is characterized by twitching of the facial muscles in response to tapping over the facial nerve, which is located in front of the ear.
3. Identify that this sign is typically associated with hypocalcemia, a condition where there is a lower than normal level of calcium in the blood.
4. Consider the role of calcium in the body, particularly in muscle contraction and nerve function, and how low levels can lead to increased neuromuscular excitability.
5. Relate this to feedback loops: in the context of calcium homeostasis, the body uses feedback mechanisms to regulate calcium levels, and a positive Chvostek's sign indicates a disruption in this balance, specifically hypocalcemia.