Types Of Blood Vessels And Their Functions
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00:00hi kids today we will learn about the blood many types of blood cells inside
00:08the blood now let's learn the types of blood vessels that carry blood blood
00:17vessels are the way along which the blood flows from the heart to every cell
00:24of the body and then flows back from every cell of the body to the heart
00:29again the size of the blood vessels depends on the amount of blood that
00:36passes through the vessel the hollow area of the blood vessel is called the
00:43lumen there are three major types of blood vessels arteries capillaries and
00:53veins let's first learn about arteries blood vessels that carry blood away from
01:03the heart are known as arteries remember a for away arteries mostly carry
01:13oxygenated blood or oxygen rich blood from the heart to body tissues or cells
01:23the only two exceptions are pulmonary and umbilical arteries that is these
01:31arteries does not contain oxygenated blood these arteries carry deoxygenated
01:40blood from the heart to the lungs to be oxygenated blood is pushed with great
01:51force from the heart to the arteries so the walls of the arteries are required
01:58to be thicker and more elastic to withstand the pressure so artery walls
02:06are thickest and most elastic amongst all types of blood vessels
02:12arterioles arterioles are narrow arteries that branch off from the ends of the arteries and
02:26carry blood to the capillaries arterioles face much lower blood pressures than arteries and
02:37so walls of arterioles are much thinner than those of arteries veins blood vessels that carry blood
02:52towards the heart are called veins vessel walls of veins is thinner than arteries veins mostly
03:06carry deoxygenated blood with two exceptions that is pulmonary and umbilical veins as these two
03:18carry oxygenated blood from the lungs to the heart the main job of veins is to return the
03:30blood from each cell of the body back to the heart veins take blood from the arteries and
03:40place it on the way back to the heart again from where the blood is sent to lungs for oxygenating
03:51veins experience lesser pressure as they receive blood from the arteries as against from the
04:04arteries arteries receive blood directly from the heart so the walls of the veins are thinner
04:14than that of arteries venules venules are similar to arterioles as they are smaller veins that
04:27connect capillaries venules pick up blood from many capillaries and deposited into larger veins
04:37for transporting it back to the heart capillaries these are very small blood vessels even thinner
04:51than our hairs vessel walls of capillaries is the thinnest compared to other blood vessels
05:01capillaries connect these arteries and veins food substances that is nutrients gases oxygen
05:14carbon dioxide and other metabolic wastes all pass in and out of the blood through these capillary
05:24walls capillaries can be found running through almost every tissue of the body capillaries
05:34connect to arterioles on one end and venules on the other end these capillaries carry blood
05:45very close to the cells of the tissues of the body in order to exchange the gases nutrients
05:55and waste products the walls of the capillaries consist of only a thin layer of endothelium so
06:06that there is a minimum of amount of structure possible between the blood and the cells and
06:14this endothelium acts as a filter to keep the blood cells inside of the vessels while allowing
06:26other things like nutrients gases and waste to move in and out of the vessels nutrients
06:38from the blood can move to the cells and waste from the cells can move to the capillaries
06:44oxygen from the blood can move to the cells and carbon dioxide from the cells can move back to
06:56the capillaries so to enable the exchange of these things between the cells and the blood so capillaries
07:09and the capillary walls are the actual means through which the nutrients and the gases are
07:17exchanged between the cells and the tissues so kids today we learn about the different types
07:28of blood vessels now you may go ahead and take a quiz to learn more bye-bye