FREE CRNI Fluid and Electrolyte Balance Questions and Answers

Question 1

The body's _______ system is the main pathway for water loss.

Accepted Answer

urinary

Answer

The urinary system, primarily through the kidneys, plays the most crucial role in regulating the body's water balance and expelling excess water. The kidneys filter blood, reabsorb necessary water, and excrete waste products dissolved in urine. While other systems contribute to water loss, the urinary system is the main pathway for controlled water excretion.

Question 2

The body loses ions mostly through its _______ system.

Accepted Answer

urinary

Answer

The urinary system, particularly the kidneys, is the primary organ system responsible for maintaining electrolyte (ion) balance in the body. The kidneys filter blood, reabsorbing essential ions like sodium, potassium, and chloride, while excreting excess ions in the urine. This precise regulation is vital for nerve function, muscle contraction, and overall cellular homeostasis.

Question 3

In most cells, careful management of cell volume (and hence cell function)

Accepted Answer

osmolarity of extracellular fluid.

Answer

Cell volume is critically dependent on the osmolarity of the extracellular fluid (ECF). Water moves across cell membranes by osmosis, from an area of lower solute concentration to an area of higher solute concentration, to equalize osmolarity. If the ECF osmolarity changes, water will move into or out of cells, causing them to swell or shrink, which can impair their function.

Question 4

The majority of the body's water balance is controlled by two organ systems that interact with one another.

Accepted Answer

urinary and cardiovascular.

Answer

The urinary system (kidneys) and the cardiovascular system work in close conjunction to maintain the body's water balance. The kidneys regulate blood volume and composition by filtering blood and adjusting water and solute excretion, directly impacting blood pressure and overall fluid balance. The cardiovascular system, by circulating blood, delivers water and solutes to the kidneys and distributes hormones that influence kidney function, ensuring efficient fluid homeostasis.

Question 5

Which of the following is caused by shrinking hepatocytes in the liver?

Accepted Answer

both glycogen breakdown and protein breakdown

Answer

Cell shrinkage, often caused by hyperosmolarity in the extracellular fluid, is a stress signal that can trigger catabolic processes within hepatocytes. When liver cells shrink, it activates pathways that lead to the breakdown of stored glycogen (glycogenolysis) to release glucose and the breakdown of proteins (proteolysis) to provide amino acids for energy or other metabolic needs. This response helps the cell adapt to osmotic stress and maintain energy supply.

CRNI Exam Practice Test

CRNI Exam Practice Test

FREE CRNI Fluid and Electrolyte Balance Questions and Answers