Arteries have thicker walls than veins because they must be able to withstand the tremendous pressure from a beating heart. Veins have thinner walls because they need more room to hold blood.Continue Reading
Arteries have more smooth muscle in their walls than veins to accommodate the pulses of blood generated by each contraction of the heart. All arteries comprise three layers: the tunica intima, the tunica media and the tunica adventitia.
The veins also consist of three layers that contain smooth muscle and connective tissue like the arteries, but in lesser amounts than the arteries. The heart cannot hold all the blood in the body at once, so the blood needs to be stored somewhere. This extra blood is stored in the veins, which have wider diameters than the arteries.Learn more about Human Anatomy
The cardiovascular system is made of three systems that work together: the heart, the lungs, and the arteries, veins, coronary and portal vessels. All of these systems are responsible for the flow of blood, nutrients, oxygen and other gases, and hormones to and from cells, states Live Science.Full Answer >
The beginning of the blood's journey through the body happens when the heart relaxes between beats and the blood flows from the atria to the ventricles from where the blood is pushedÂ into the large arteries and thenÂ on to the smaller arteries where it releases oxygen and nutrients. The blood, nowÂ low on oxygen, gets pushed into the veins and travels back to the heart.Â Once the blood goes back to the heart, it is oxygenated and the process begins again.Full Answer >
The circulatory system of a pig is much like that of a human, with a four-chambered heart and a system of arteries and veins that carry blood. All vertebrates use a similar system to transport and distribute oxygen molecules to the cells of the body.Full Answer >
The blood in human body flows from the heart to the arteries which branch into arterioles and then smaller capillaries, which then merge to form venules that merge into larger veins that carry blood back to the heart. This process is called the circulatory system.Full Answer >