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. The saltwater is the solution because that's what the solvent and solute make. A way to remember is that if you spilled salt on the table you need to get rid of it.