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.
Pericardium. The pericardium is the double walled sac that contains the heart and the roots of the great vessels that leave from or enter the heart. There are two layers of the pericardial sac: 1  Fibrous Pericardium: The fibrous pericardium is a strong layer which covers the heart. 2  It is made up mostly of connective tissue.3  Its job is to protect the heart from overstretching and also anchor it in place.here are two layers of the pericardial sac: 1  Fibrous Pericardium: The fibrous pericardium is a strong layer which covers the heart. 2  It is made up mostly of connective tissue. 3  Its job is to protect the heart from overstretching and also anchor it in place.