Bloodletting was a regular form of medical treatment for ancient Greeks, with its benefits debated by scholars such as Hippocrates and Galen. Bloodletting in Central America. Bloodletting or autosacrifice was a cultural trait of most of the societies in Mesoamerica, beginning with the Olmec perhaps as early as 1200 AD. 1  This type of religious sacrifice involved a person using a sharp instrument such as an agave spine or shark's tooth to pierce a fleshy part of his own body.
A mixture formed when one substance dissolves in another is called a solution. One example is salt water. In a solution, the component substances cannot be distin-guished from each other and they remain evenly distrib-uted throughout; that is, the mixture is homogeneous (ho-mo-JE-ne-us). The dissolving substance, which in the body is water, is the solvent. The substance dis- solved, salt in the case of salt water, is the solute . An aqueous (A-kwe-us) solution is one in which water is the solvent. Aqueous solutions of glucose, salts, or both of these together are used for intravenous fluid treat- ments.
A solvent is a substance which dissolves a solute. When a solvent dissolves into a solute, it creates a solution. If i pour salt into a cup of water. The salt is the solute because it's being dissolved and the water is the solvent because it is doing the dissolving.