Fluids, Electrolytes, and pH Resources

By the End of This Module
You Will be Able to:

• List the factors that determine body waterThe universal solvent essential for life. content and describe the effect of each factor.
• Indicate the relative fluid volume and solute composition of the fluid compartmentsDivisions of body water: intracellular, extracellular, and transcellular. of the body.
• Contrast the overall osmotic effects of electrolytes and nonelectrolytes.
• Describe factors that determine fluid shifts in the body.
• List the routes by which water enters and leaves the body.
• Describe feedback mechanisms that regulate water intake and hormonal controlsVariables that remain constant to ensure a fair test. of water output in urineThe liquid waste excreted by the kidneys..
• Explain the importance of obligatory water losses.
• Describe possible causes and consequences of dehydrationA condition in which fluid loss exceeds intake, leading to a decrease in total body water., hypotonic hydrationExcess water intake dilutes ECF, causing water to move into cells (ICF), leading to swelling., and edemaExcess fluid in interstitial spaces..
• Indicate routes of electrolyte entry and loss from the body.
• Describe the importance of sodium(Na⁺): Major ECF cation; important for fluid balance, nerve function. in the body’s fluid and electrolyte balanceThe maintenance of appropriate levels of ions like sodium, potassium, calcium, and magnesium in body, and indicate its relationship to normal cardiovascular systemThe organ system that includes the heart and blood vessels, responsible for circulating blood and ox functioning.
• Describe mechanisms involved in regulating sodium balance, blood volume, and blood pressureThe force exerted by gases in the respiratory system, affecting airflow and gas exchange..
• Explain how potassium(K⁺): Major ICF cation; essential for muscle and nerve function., calcium, and anionA negatively charged ion. balances in plasmaThe liquid component of blood. are regulated.
• List important sources of acids in the body.
• List the three major chemical bufferA substance that acts quickly to temporarily stabilize pH (e.g., bicarbonate).<buffer systemsGroups of chemical or physiological systems that stabilize pH. of the body and describe how they resist pH changes.
• Describe the influence of the respiratory systemThe organ system responsible for gas exchange (oxygen and carbon dioxide). on acid-base balanceThe regulation of hydrogen ion concentration to maintain a stable pH..
• Describe how the kidneys regulate hydrogen and bicarbonate(HCO₃⁻) – A crucial buffer in blood that helps maintain pH balance; formed when carbon dioxide ion concentrations in the blood.
• Distinguish between acidosisA condition where blood pH falls below 7.35. and alkalosisA condition where blood pH rises above 7.45. resulting from respiratory and metabolic factors. Describe the importance of respiratory and renal compensations to acid-base balance.