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Published byTheresa Hicks Modified over 8 years ago
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Do Now What artia/ventricles of the heart have oxygenated blood? Why do you think that oxygenated/non- oxygenated blood are separated?
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Circuits Travel in two loops (circuits) Pulmonary Circuit: Heart Lungs Heart Systemic Circuit: Heart Body Heart
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CIRCUITS & PATHWAYS
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Blood Vessels Two types Arteries (move away from heart) Veins (move towards heart)
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Three Layers of Blood Vessels Tunica interna: innermost layer. Prevents blood from clotting Tunica media: middle layer. Muscles, move blood Tunica externa: Outermost layer. Connective tissue Connects blood vessel to surrounding tissue.
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Size of vessels At first, there are only a few arteries leaving the heart (they are large) They start to branch off into smaller arterioles Arterioles then branch to smaller capillaries Arteries arterioles capillaries Highway boulevard street
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Size of vessels Same with veins… Capillaries Veinule Veins
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Capillaries?? This is where arterioles and veinules meet – the SITE OF GAS EXCHANGE in the blood! Thin walls Diffusion is force responsible for these exchanges
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Travel Essay – QUIZ GRADE Start as a blood cell. Start in the heart as low-oxygen blood and explain your trip around the body (you may choose where you travel to) and back to the heart You MUST mention… The four chambers of the heart The major veins and arteries Smaller blood vessels you go through What is exchanged and where
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