Three major areas of study within ethics recognised today are: 1  Meta-ethics, concerning the theoretical meaning and reference of moral propositions, and how their truth values (if any) can be determined. 2  Normative ethics, concerning the practical means of determining a moral course of action.
In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.he heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, and also assists in the removal of metabolic wastes.
Confidence votes 128. There's a hierarchy to this; in the largest form, the heart is made from muscle tissue; muscle tissue is made from cells, and cells are composed of elements. The heart is hollow and shaped like a cone.It is made of specialized muscle tissue which allows it to beat your entire lifetime.he heart is comprised of the left and right atria and the left and right ventricles. The atria pump blood to the lungs, where it is oxygenated. The oxygenated blood then retu â¦ rns to the heart, where the ventricles pump it to the rest of the body.