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Do Now

Do Now. What artia /ventricles of the heart have oxygenated blood? Why do you think that oxygenated/non-oxygenated blood are separated?. Circuits. Travel in two loops (circuits) Pulmonary Circuit: Heart  Lungs  Heart Systemic Circuit: Heart  Body  Heart. Circuits & Pathways.

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Do Now

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  1. Do Now • What artia/ventricles of the heart have oxygenated blood? • Why do you think that oxygenated/non-oxygenated blood are separated?

  2. Circuits • Travel in two loops (circuits) • Pulmonary Circuit: Heart  Lungs  Heart • Systemic Circuit: Heart  Body  Heart

  3. Circuits & Pathways

  4. Blood Vessels • Two types • Arteries (move away from heart) • Veins (move towards heart)

  5. 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.

  6. 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

  7. Size of vessels • Same with veins… • Capillaries  Veinule  Veins

  8. 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

  9. 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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