The heart biologic of the love The heart and blood vessels constitute the cardiovascular (circulatory) system. The love pumps the blood to the lungs so it can pick increase oxygen and then pumps oxygen-rich blood come the body.... read much more and also blood ship constitute the cardiovascular (circulatory) system. The blood outline of Blood Blood is a facility mixture the Plasma (the liquid component) Red blood cell (the oxygen-carrying component) White blood cells (the cells that defend against infection) Platelets (particles that... read more turn in this device delivers oxygen and also nutrients come the tissues of the body and also removes waste assets from the tissues.
You are watching: Why do arteries need to be thick, muscular, and elastic?
Blood travels from the love in arteries, which branch right into smaller and also smaller vessels, eventually coming to be arterioles. Arterioles affix with even smaller blood vessels called capillaries. With the thin walls of the capillaries, oxygen and also nutrients happen from blood into tissues, and waste products pass native tissues right into blood. From the capillaries, blood passes into venules, then right into veins to go back to the heart.
Arteries and arterioles have reasonably thick muscular walls because blood pressure in lock is high and because lock must change their diameter to keep blood pressure and also to control blood flow. Veins and venules have actually much thinner, less muscular wall surfaces than arteries and also arterioles, largely since the push in veins and venules is much lower. Veins might dilate to accommodate raised blood volume.
If a blood vessel breaks, tears, or is cut, blood leaks out, leading to bleeding. Blood may circulation out of the body, as external bleeding, or it may circulation into the spaces around organs or straight into organs, as interior bleeding.
The arteries, which are strong, flexible, and also resilient, carry blood far from the heart and bear the highest possible blood pressures. Since arteries room elastic, they narrow (recoil) passively once the heart is relaxing between beats and also thus assist maintain blood push The Body"s control of Blood push High blood pressure (hypertension) is persistently high pressure in the arteries. Often no reason for high blood pressure have the right to be identified, yet sometimes that occurs as a result of one underlying... read much more
Capillaries room tiny, extremely thin-walled vessels that act together a bridge between arteries (which bring blood away from the heart) and veins (which lug blood back to the heart). The thin walls of the capillaries permit oxygen and nutrients to happen from the blood right into tissues and enable waste products to pass from tissues into the blood.
See more: Air Pressure Is Usually Highest When The Air Is, The Highs And Lows Of Air Pressure
Blood operation from the capillaries right into very little veins referred to as venules, then into the veins the lead ago to the heart. Veins have actually much thinner walls than do arteries, largely because the pressure in veins is so much lower. Veins deserve to widen (dilate) as the amount of liquid in them increases. Part veins, particularly veins in the legs, have valves in them, to stop blood from flowing backward. Once these valves leak, the backflow that blood can cause the veins come stretch and become elongated and also convoluted (tortuous). Stretched, tortuous veins near the body"s surface are called varicose veins Varicose Veins Varicose veins room abnormally enlarged superficial veins in the legs. Varicose veins might ache or cause itching or a emotion of tiredness. Doctors have the right to detect varicose veins by examining the... read more