Metabolism

The exam rarely asks “what is metabolism” outright; it tests it through assessment findings that reveal a sped-up or slowed-down body. The tell is a cluster: weight loss, heat intolerance, tachycardia, and diarrhea point to a hypermetabolic state (hyperthyroidism), while cold intolerance, fatigue, weight gain, and constipation signal a hypometabolic one. The priority answer usually hinges on the cardiac consequence — in thyroid storm, high fever (often above 38.5 C) with tachyarrhythmia such as atrial fibrillation is the emergency, not the weight change. Watch drug clearance: a hypometabolic client clears medications slowly, so standard doses accumulate toward toxicity.

A classic trap is confusing metabolism with its related processes. Homeostasis is the feedback regulation that holds variables at set point; metabolism is the underlying chemistry being regulated. Acidosis can be a product of deranged metabolism (ketoacids in DKA), not metabolism itself. And edema reflects fluid distribution, not energy turnover — though low albumin from reduced protein synthesis lowers oncotic pressure and can drive it. Memory hook: hyper = hot, fast, thin; hypo = cold, slow, heavy.