placenta. n, pl-tas or-tae (-tiË). 1. (Anatomy) the vascular organ formed in the uterus during pregnancy, consisting of both maternal and embryonic tissues and providing oxygen and nutrients for the fetus and transfer of waste products from the fetal to the maternal blood circulation.
Definition. To be brief, optimal health is an individual person's physical, emotional and mental health abilities. That is, it is the health goals that a person can realistically achieve to feel their personal best. No two people's health goals are the same, that's why optimal health is such an individualized matter. One person might focus on physical health while to another healing emotional wounds is a more pressing matter. It really just depends on what is important to you.
The word optimum in biology is often used to denote to a condition or a result that is favourable or best for a particular living entity. For instance, the term optimum pH refers to the pH resulting in maximal activity of a particular enzyme. Differing pH levels affect the shape of an enzyme.