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.
Layers of the Heart Wall. The heart can be broken up into three major tissue layers: the endocardium, myocardium, and pericardium. Endocardium. The endocarium is the innermost, thin and smooth layer of epithelial tissue that lines the inner surface of all the heart chambers and valves.This layer is made of thin and flat cells that are in direct contact with the blood that flows in and out of the heart.ayers of the Heart Wall. The heart can be broken up into three major tissue layers: the endocardium, myocardium, and pericardium. Endocardium. The endocarium is the innermost, thin and smooth layer of epithelial tissue that lines the inner surface of all the heart chambers and valves.