-Blood transports oxygen and nutrients from the lungsand the digestive tract to body cells.-It carries away carbon dioxide and other wasteproducts that the body does not need.
Keeps body at the right temperature Carries hormones to the body’s cells Sends antibodies to fight infection Slides 2-3 made by Hong En Helps blood clotting and heal body tissues
THE COMPONENTS OF BLOOD ANDTHEIR FUNCTIONS Plasma Fluid part of blood Carries carbon dioxide, hormones and waste Red blood cells Contain haemoglobin which carries oxygen Made in the bone marrow. White blood cells Produce antibodies and destroy harmful microorganisms Made in the bone marrow Platelets Clump together to form clots to protect the body
Blood VesselsThere are three blood vessels. The artery, vein and capillary.Blood vessels are hollow tubes which transfers blood to all parts of the body.
Arterythe Artery consists of three lAyers. the outer tissue, the musculAr middle And the inner epitheliAl cell.the Artery cArries blood rich in oxygen to the cApillAries for the exchAnge of oxygen to cArbon dioxide.you cAn use it to meAsure heArt beAts And blood pressure becAuse it expAnds And contrActs.
VeinThe vein, similar to the Artery, has three layers. However, the outer layer is thinner.The vein has lesser pressure than the artery, so it is weaker than the artery.The vein contains waste- rich blood as it absorbs gas from the capillaries after the exchange of oxygen to carbon dioxide.The vein contains a vein valve which pushes blood up against gravity.
CapillariesUnlike the artery and the vein, the capillaries have only one layer. Which is only one epithelial cell thick. Slides 1, 5-8 and 11 made by LeonardIt exchanges air from oxygen to other waste products.
THE STRUCTURE OF ARTERIES, VEINSAND CAPILLARIES THEIR FUNCTIONS Arteries Carry blood away from the heart (always oxygenated) Have thick muscular walls Have small passageways for blood (internal lumen) (central cavity of a hollow structure in an organism or a cell) Slide 4 and 9 made by Cherie Contain blood under high pressure Veins Carry blood to the heart (always de-oxygenated) Have thin walls Have larger internal lumen Contain blood under low pressure Capillaries Found in the muscles and lungs Microscopic – one cell thick Very low blood pressure Gas exchange takes place
http://www.elmhurst.edu/~chm/vchembook/images2/261gasexchan ge.jpg http://www.daviddarling.info/images/blood_clotting.gif Picture in slide 5 made by Leonard with the help of http://www.botany.uwc.ac.za/sci_ed/grade10/manphys/images/fig4a .gif Picture in Slide 1 made by Leonard with the help of http://www.heartzine.com/diagrams/circulatory-system.jpg