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 Blood pressure is the force of blood against the walls of arteries as the heart pumps it around the body. It's typically measured using two numbers: systolic pressure (when the heart beats) and diastolic pressure (when the heart is at rest). The unit of measurement is usually in millimeters of mercury (mmHg). Normal blood pressure is generally considered to be around 120/80 mmHg. High blood pressure (hypertension) can be a health concern and may require management and treatment.

 Osmotic pressure is the pressure exerted by a solvent when it flows through a semipermeable membrane to equalize the concentration of solute on both sides. It's a colligative property, meaning it depends on the number of solute particles in a solution rather than their identity. The greater the concentration of solute, the higher the osmotic pressure. In biological systems, osmotic pressure plays a crucial role in processes like water absorption in plant roots and maintaining cell shape and function. It's also important in medical and industrial applications, such as in pharmaceuticals and chemical processes.

 A cell is the basic structural and functional unit of all living organisms. It is the smallest unit of life capable of independent existence and carries out various processes essential for an organism's survival, growth, and reproduction. Cells can vary in size, shape, and function, but they typically contain a nucleus, cytoplasm, and cell membrane. The nucleus contains genetic material, the cytoplasm houses organelles and metabolic processes, and the cell membrane controls the passage of substances in and out of the cell.