| In addition to the main function of transporting oxygen and nutrients to organ tissues and transporting CO2, waste products to organs such as the lungs and kidneys for removal from the body. Blood vessels also play an important role in regulating the body's blood pressure. Arteries come in different sizes. In large arteries, the walls of the vessels have special elastic fibers that can stretch and contribute to the heart's ejection function (blood continues to be pumped even though the heart is at rest). ). Arteries can also respond to signals from the nervous system to contract or relax to help regulate the body's blood pressure. Pressure and chemical receptors in the blood vessels help to receive information about the body's hemodynamic status and transmit these signals to the brain. The brain then sends out signals to the vascular system that change the size of the blood vessels (vasoconstriction or vasodilation). In simple terms, vasoconstriction will increase blood pressure and conversely, vasodilation will lower blood pressure. However, the vascular system is not the only organ that contributes to the regulation of blood pressure, but also involves many complex systems. Arteries are the smallest arteries of the body. They transport blood to the capillaries and also have the same dilating function as the arteries, contributing to the control of blood flow to the capillaries. The capillaries in the organ tissue will fuse to form the venules. The venules aggregate to form larger veins. Veins are responsible for transporting blood back to the heart. Inside the veins in the lower extremities of the body are venous valves that make it easier for blood to return to the heart without flowing back. Blood, the heart and the vessels through which blood is pumped around the body, together make up the cardiovascular system. They are vital for carrying nutrients, oxygen and waste around the body. Show Blood is made up of cells and plasma. An average adult has about 5 litres of blood in their body. As well as carrying cells, nutrients, oxygen and waste, blood also helps to regulate body temperature. Blood cellsMost blood cells are made in the bone marrow. There are 3 main types of blood cells:
Red blood cellsRed blood cells transport oxygen from the lungs to the rest of the body, and carry waste products to the lungs or kidneys for release. Red blood cells contain haemoglobin, which is the protein that enables them to carry oxygen. White blood cellsWhite blood cells are part of the immune system. They detect and fight infections or foreign substances that enter the body. There are 5 main types of white blood cell — neutrophils, lymphocytes, monocytes, eosinophils and basophils. PlateletsPlatelets are small cell fragments that help the blood clot. They circulate in the blood until there is an injury to a blood vessel. Then they clump together and help a clot form at the injury site. PlasmaPlasma is the straw-coloured fluid that carries the blood cells. It makes up around half of your blood. It also carries the nutrients from our diet such as sugars, fats, proteins, vitamins and minerals. Blood testsYour blood can give useful information on how well your body is working and help doctors test for some diseases and conditions. Some common blood tests are:
Blood typesEveryone has a particular blood type (blood group), which is determined by the genes inherited from their parents. The main blood types are A, B, AB, and O. Doctors check a person’s blood type before a blood transfusion or organ transplant, to ensure compatibility with the donor’s blood type. Blood type is also important in pregnant women to work out which Rhesus type they are and whether the mother’s blood and baby’s blood are compatible. What are blood vessels?Blood vessels are the network of tubes through which blood is pumped around the body. Along with the heart and the blood, the blood vessels form the cardiovascular system. The 3 main types of blood vessels are:
Blood leaves the heart in large arteries, then moves through progressively smaller ones to reach the capillaries in the tissues. Oxygen and nutrients pass through the thin capillary walls into the tissues, and waste products from the tissues pass into the capillary blood. The blood then leaves the capillaries and moves into veins that progressively get larger as they get closer to the heart. Once at the heart, this de-oxygenated blood (blood that needs oxygen) enters the right-hand side of the heart. From there it is sent to the lungs where the carbon dioxide is removed and replaced with oxygen. Some of the waste products that were picked up by the capillaries from the tissues are filtered out from the blood as it flows through the kidneys. The walls of arteries are strong and elastic and can expand and contract to lower or increase blood pressure, according to your needs. Blood pressure is the pressure of your blood on the walls of the arteries as your heart pumps blood around the body. Veins have thinner walls, and some veins (for example in the legs) have valves to prevent the backflow of blood due to gravity. What are the 5 type of blood vessels?Therefore, five types of blood vessels are arteries, veins, capillaries, arterioles, and venules.
What are 3 types of blood vessels?There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart.
What are the main types of blood vessels?This vast system of blood vessels - arteries, veins, and capillaries - is over 60,000 miles long. That's long enough to go around the world more than twice! Blood flows continuously through your body's blood vessels.
What are the types of blood vessels Class 8?The three types of blood vessels are arteries, veins and capillaries.
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What are the types of blood vessels
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