University revision · Immunology

Immunology

Question 1 of 7 Course: Biomedical Science(Degree)

What is the key difference between active and passive immunity?

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Polydipsia is the medical term for excessive thirst, a symptom that drives increased fluid intake. It is often a compensatory response to significant fluid loss, such as through excessive urination (polyuria). Polydipsia is a classic symptom of two major endocrine disorders: Diabetes mellitus (where high blood glucose causes osmotic diuresis) and Diabetes insipidus (where a lack of ADH or renal resistance to it prevents water reabsorption). It can also occur in other conditions like hypercalcemia, certain psychiatric disorders (psychogenic polydipsia), or as a side effect of medications. The body's thirst mechanism, regulated by the hypothalamus, is triggered by increased plasma osmolality or decreased blood volume, making polydipsia a key clinical sign of underlying fluid or electrolyte imbalance.

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