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 simple solution is basically two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water). As a rule of thumb, there is usually more solvent than solute. Be patient with the next sentence as we put it all together. The amount of solute that can be dissolved by the solvent is defined as solubility.