The circulatory system is composed of the cardiovascular system (blood, veins) and the lymphatic system (lymph vessels). Organs and tissues of the body are made up of a network of blood vessels and lymph vessels. Blood, which is flowing in blood vessels, supplies the cells with oxygen and nutrients and carries away carbon dioxide and wastes. The function of the heart allows the circulation of blood in the vascular system. Continue reading
A cone shaped, muscular, hollow organ that is situated between the two lungs on the left side of the chest. Its lower part lays in the middle of the tendinous diaphragm. The incoming and outgoing great vessels hold it in its place. It is divided into a widened upper part and a rounded off lower tip. Its size is generally the same as of a clenched fist, but there are differences according to age, gender, stature and the work of the heart. Looking at its surface we can see a furrow which divides it into two parts. Continue reading
The vascular system is composed of arteries, veins, between which are found the capillaries. The three types of blood vessels have different structures. They all have an inner cell layer in common which is suitable for blocking blood coagulation.
Arteries are blood vessels with thick, muscular walls that carry blood away from the heart to the periphery. By leaving the heart together with the aorta and after branching out successively, they lead into the capillary system. Continue reading