List and describe the three tunics in most blood vessels
List and describe the three tunics in most blood vessels
The human circulatory system is one of the major eleven organ systems in the human body and is responsible for the circulation of blood through the body. It is also called the vascular system or the cardiovascular system. The main components of the circulatory system are blood, blood vessels and heart.
The heart is a muscular organ located slightly toward the left side of the breastbone. The size of the heart is approximately equivalent to the size of fist. The heart is a four chambered structure that is responsible for pumping the blood into the vessels of the cardiovascular system. The specialized cells of the heart include cardiomyocytes and pacemaker cells. The rhythm at which the heart is pumped is controlled by the pacemaker cells. These cells have the ability to get excited and generate current that causes the contraction of the heart, thereby pumping the blood into the vessels.
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