Homeostasis & Body Fluid Regulation MCQs PDF

Comprehensive MCQs on Homeostasis and Body Fluid Regulation Includes: Homeostasis systems, Body fluid compartments, Osmolarity and Tonicity, etc. 1. Which component of the homeostasis control system detects changes in the environment? A) Effector B) Control center C) Receptor D) Regulato...

Comprehensive MCQs on Homeostasis and Body Fluid Regulation Includes: Homeostasis systems, Body fluid compartments, Osmolarity and Tonicity, etc. 1. Which component of the homeostasis control system detects changes in the environment? A) Effector B) Control center C) Receptor D) Regulator Answer: C) Receptor Explanation: The receptor detects environmental changes and sends information to the control center for processing. 2. What type of feedback mechanism amplifies the original stimulus? A) Negative feedback B) Positive feedback C) Homeostatic feedback D) Neutral feedback Answer: B) Positive feedback Explanation: Positive feedback increases the response to an initial stimulus, often moving the system further from its starting state. 3. Which of the following is a hypotonic intravenous solution? A) 0.9% Saline B) D5W (5% Dextrose in Water) C) 5% Dextrose in 0.9% Saline D) Lactated Ringer's Solution Answer: B) D5W (5% Dextrose in Water) Explanation: D5W is initially isosmotic but becomes hypotonic as glucose is metabolized, making it ideal for rehydrating cells. 4. What is the primary cation in extracellular fluid? A) Potassium B) Sodium C) Calcium D) Magnesium Answer: B) Sodium Explanation: Sodium is the main extracellular cation and plays a key role in fluid balance and nerve function. 5. Osmolarity measures the concentration of solutes per liter of ____. A) Solution B) Solvent C) Plasma D) Blood Answer: A) Solution Explanation: Osmolarity is defined as the number of solute particles per liter of solution, affecting fluid movement across membranes.