![]() ![]() ![]() Hypernatremia, hyponatremia Hyponatremia Hyponatremia is defined as a decreased serum sodium (sNa+) concentration less than 135 mmol/L. Hypernatremia occurs either from a lack of access to water or an excessive intake of sodium. Serum sodium is the greatest contributor to plasma osmolality, which is very tightly controlled by the hypothalamus via the thirst mechanism and antidiuretic hormone (ADH) release. Hypernatremia Hypernatremia Hypernatremia is an elevated serum sodium concentration > 145 mmol/L. Hypernatremia are maintained rigorously by the transport of water and substances between compartments. Osmolality is expressed in terms of osmoles of solute per kilogram of solvent. ![]() The relative charge and osmolarity Osmolarity The concentration of osmotically active particles in solution expressed in terms of osmoles of solute per liter of solution. Each compartment contains different concentrations of ions and osmolar molecules. A cell membrane is composed of a phospholipid bilayer and proteins that function to protect cellular DNA and mediate the exchange of ions and molecules. Intracellular and extracellular fluids are separated into compartments by semipermeable membranes, and the transport of fluid and ions is maintained by channels Channels The Cell: Cell Membrane in the cell membrane Cell Membrane A cell membrane (also known as the plasma membrane or plasmalemma) is a biological membrane that separates the cell contents from the outside environment. Intracellular fluid is present inside the cells and makes up ⅔ of the total body water. Extracellular fluid is present outside the cells and makes up ⅓ of the total body water. The adult human body is made up of 60% water and is divided into extracellular and intracellular fluid compartments. Students: Educators’ Pro Tips for Tough Topics.Maternity Nursing and Care of the Childbearing Family. ![]()
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