Answer:
The circulatory system is one of the most important systems in the human body. It consists of the heart and blood vessels. It is what makes the blood in our body go round. The blood carries oxygen, nutrients and hormones and takes them to where they are needed and removes the waste products like carbon dioxide.
The circulatory system nourishes every cell, tissue, organ and organ system in the body. There are approximately ten pints of blood constantly circulating through seventy- five- thousand miles of blood vessels. These blood vessels reach every cell in the human body. Once they reach the cells they deliver much needed oxygen and remove carbon dioxide and other…show more content…
Arteries have walls that are much more elastic than veins because they transport under high pressure. The arteries cause you to feel a pulse in your wrist because of the great force of the heart pumping new blood into them. All the blood in the arteries, except for the pulmonary arteries, is oxygenated. The arteries divide up into smaller vessels called arterioles so have more muscle fibres and less elastic tissue than the larger arteries which allows them to contract and make the vessels narrower to restrict the blood flow. The arterioles divide up even more to form a branching network of vessels passing between the cells of every living tissue. The final branches are the capillaries.
