Which term denotes the state of fluid balance in the body?

• A. Homeostasis
• B. Pharmacology
• C. Hypovitaminosis
• D. Ion

Answer: (A)

Maintaining fluid balance is part of keeping the body’s internal environment stable, which is what homeostasis describes. Homeostasis is the body's way of regulating water and electrolytes so cells function properly. It involves mechanisms like thirst, kidney regulation, and hormones such as antidiuretic hormone and aldosterone to balance intake and output and to keep blood volume and pressure within a healthy range. When these regulatory systems work together, fluid levels stay steady, preventing dehydration or edema and supporting overall tissue function. The other terms don’t describe a state of balance: pharmacology deals with drugs, hypovitaminosis is vitamin deficiency, and an ion is simply a charged particle.