February_14th_circulation-respiration - February 14th...

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February 14 th , Circulation/Repiration Circulation: exchange of gases o Closed system-pipes o Open system-consist of heart and tubes, dumped in body and finds its way to the heart Need: pipes, pumping system (heart), exchange sites Circulatory system helps to->nutrients flow into blood, nitrogen waste carried in blood and removed in kidney, immune system Open circulatory system-> dumps blood into the region around the blood Closed system-> 2 chambers: incoming (atrium) Outgoing (ventricle) o Left side pumps blood into body o Right side pumps blood into lungs Veins have oxygen, arteries do not Aorta:main artery leaving heart. Aorta goes from left side Pulmonary goes from right side Lungs are not the same on both sides because the heart takes up some space Vena cava o superiorL takes from upper part and puts in right atrium o inferior: takes from lower part and puts back in right side of atrium heart has valves that only let blood go through one way blood flow regulation
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Unformatted text preview: • pace maker on right side of atrium-> ssends a signal to pump both sides of atrium. Base is triggered o brain. Regulated by signals from the base of the brain that regulate pumping by levels of CO2 in body. • Atrium sends signal to AV node which sends a signal to ventrical o Atrium contracts, ventricle contracts o Rate of heart beat determines amount of blood • Blood goes from heart to artery • High blood pressure means artery doesn’t contract and artery must use pressure to let blood flow through • Sphincters close when its cold, sphincters open when its warm (temperature regulation) • Control of peripherical Circulation o Hear beat->amount o Sphincter muscles-> where it flows • Blood composition o Water 88% o Plasma (liquid) o Ions o Plasma proteins (albium is most common type) o Fibrinogen o Immunoglobins (antibodies-disease fighting) o Nutrients o Waste products of metabolism (mostly nitrogen) o hormones...
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  • Fall '11
  • Brooks
  • right atrium, atrium

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