Homeostasis and Feedback Systems

Explain how maintaining a stable internal environment creates a dynamic equilibrium suitable for cell survival, and how internal or external disruptions can cause homeostatic imbalance, disease, or death.

Classify intracellular fluid and the major extracellular fluids—interstitial fluid, plasma, lymph, cerebrospinal fluid, synovial fluid, aqueous humor, and vitreous humor—by compartment and location, and explain why extracellular fluid is called the body’s internal environment.

Compare nervous-system and endocrine-system regulation by signal type, typical speed of response, and ability to act independently or together to maintain homeostasis.

Given a homeostatic scenario, identify the controlled condition, stimulus, receptor, input, control center, output, effector, and response, and explain the role of each of the three basic feedback-system components.

Classify a feedback loop as negative or positive and justify the classification by determining whether its response reverses or reinforces the initial change.

Analyze the regulation of elevated blood pressure and the progression of childbirth by mapping each example onto the feedback pathway, explaining how blood pressure is restored in the first case and how birth ends the second cycle.

Differentiate homeostatic imbalance, disorder, and disease, and classify patient-reported or observed findings as symptoms or signs in short clinical scenarios.

Distinguish epidemiology, pharmacology, and diagnosis by matching each term to its focus and selecting the appropriate term for a clinical question or task.