Pavel Novotny

Cardiovascular system
Main article: Cardiovascular system
The cardiovascular system comprises the heart, veins, arteries and capillaries. The primary function of the heart is to circulate the blood, and through the blood, oxygen and vital minerals, to the tissues and organs that comprise the body. The main organ of the cardiovascular system, the heart, is generally located in the middle of the thorax. The left side (the left ventricle and left atrium) is responsible for pumping blood to all parts of the body, while the right side (right ventricle and right atrium pumps only to the lungs. The heart itself is divided into three layers called the endocardium, myocardium and epicardium, which vary in thickness and function

With regard to living things, a body is the integral physical material of an individual. "Body" often is used in connection with appearance, health issues and death. The study of the workings of the body is physiology.

The human body is the entire physical and mental structure of a human organism, and consists of a head, neck, torso, two arms and two legs.

By the time the human reaches adulthood, the body consists of close to 10 trillion cells, the basic unit of life. Groups of cells combine and work in tandem to form tissue, which combines to form organs, which work together to form organ systems.