Types of Blood Vessels
Science tuition class in Miracle Learning Centre is fun and enriching. You will learn about the different aspects of Science and how to learn study skills too. If you do not like or understand science, you must definitely attend the Science tuition class at Miracle Learning Centre to arouse and reignite your interest. Let us learn about the types of blood vessels in this Science tuition lesson.
There are 3 types of blood vessels in the body namely artery, vein and capillary. Arteries have thick, elastic and muscular walls that carry blood away from the heart to all other parts of the body. All arteries except pulmonary artery carry oxygenated blood and have no valves. The function of an artery is to carry oxygen-rich blood away from the heart to all of the body’s tissues. They branch several times, becoming smaller and smaller as they carry blood further from the heart into organs.
When the main artery is severely blocked, there is a drastic drop in oxygen flow. A heart attack may occur. It is very important for the heart attack victim to get to the hospital as fast as possible or have medical personnel perform CPR (Cardiopulmonary resuscitation). Cardiopulmonary resuscitation is an emergency procedure that combines chest compressions often with artificial ventilation in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest.
On the other hand, veins have thin and less elastic walls that carry blood from the body to the heart. Veins are blood vessels that take the blood back to the heart; this blood contains oxygen and is rich in waste products that are to be excreted or removed from the body. All veins except the pulmonary vein carry deoxygenated blood and have valves to prevent blood from flowing away from the heart. Veins become larger as they get closer to the heart. The superior vena cava us the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.
Capillaries are small, thin blood vessels that connect the arteries and the veins. Their thin walls allow oxygen, nutrients, carbon dioxide, and the other waste products pass to and from cells. In addition, capillary connect arteries to veins and have very thin walls which allow oxygen, nutrients, and waste products to diffuse between cells into the bloodstream. They have no vales and carry both oxygenated and deoxygenated blood.
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