The Human body is composed of a whole of separate organ systems, which are all indispensable for the survival of human body. One of the more indispensable ones is the cardiovascular system. It consists of three major components: Heart, Blood and Blood vessels.
If you look at the word "Cardiovascular", you will swiftly appreciate that it is made of two component words: "Cardio" and "Vascular". Cardio is derived from cardiac, which means connected to heart and vascular means connected to blood vessels. So the term cardiovascular itself shows the meaning of it.
The most indispensable component of the cardiovascular law is heart. It is so indispensable for the survival of human body that with no a normal functioning heart, there is no hope of life for the individual. Heart is a hollow muscular organ that performs as a potent pump to drive blood throughout the human body within the blood vessels. It has strong muscular walls, which are comprised of specialized muscle fibers that are distinctive from all other muscle fibers of human body. The muscle of heart is therefore identified as a personel type of muscle and is known as cardiac muscle. Cardiac muscle is very potent and resilient and for that calculate human heart is so strong in executing its pumping activity that it needs hardly any rest throughout the unblemished lifespan of an individual. The muscular part of the heart, which forms the walls, is lined on the covering by pericardium and on the inside by endocardium. Human heart is not a very simple hollow pump. Instead it is greatly industrialized and is divided up into four chambers separated from one other by intervening walls and valves.
The second part of the cardiovascular system, the blood, is also very critical. With no blood, the opinion of life for a human body becomes impossible. Blood delivers all the required substances to all tissues of body and takes out wastes from them. It is pumped by the heart and moves within the blood vessels to unblemished its duties in the whole human body. Blood is composed of two components: plasma and formed elements. Plasma makes about 55% of the blood and major division of it is water. Alternatively, formed elements make about 45% of the blood and are of three indispensable types: Red Blood Cells, White Blood Cells and Platelets.
The third section of cardiovascular system, the blood vessels, forms an broad network for the movement of blood in the unblemished human body. They are of three main types. The ones that deliver blood away from the heart to the body tissues are called arteries. They have thick walls and are very elastic. The second variety of blood vessels are very tiny and can be seen only with microscope. They are called capillaries and there role is to ensure proper exchange of substances among blood and body cells. The third type of blood vessels; veins, bring the blood back to heart from body tissues. They have fairly thinner walls and are not very elastic.
