Lesson 14 - Lesson 14 Animal Blood Circulation Why circulatory system Responsible for the delivery of oxygen and nutrients to all cells as well as

Lesson 14 - Lesson 14 Animal Blood Circulation Why...

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Lesson 14: Animal Blood Circulation Why circulatory system? Responsible for the delivery of oxygen and nutrients to all cells as well as removing carbon dioxide in waste products Single celled organisms o Use their cell surface for point of exchange with external environment Multi-cell organisms o Must transport throughout the body o Must have circulatory system o Three purposes for this Transportation Regulation By carrying regulatory hormones and temp Protection Mechanical wounds and invading pathogens Composition of Blood- formed elements Plasma o Made most of water o Formed elements: Erythrocytes o Hemoglobin Binds and transports oxygen 25% of total volume of blood Leukocytes o White blood cells o Less than 1 percent of blood Platelets o Cell fragments used in blood clotting Stem cells and the production of formed elements: Begins in bone marrow Pluripotent stem cells Hematopoiesis o When oxygen availability drops the kidney converts plasma protein: Erythropoietin (EPO) o Stimulates production of erythrocytes o Increases O2 capacity Erythropoiesis o Action is called
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Platelets and Blood Clotting Slowly Types of Circulatory Systems
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No circulatory system: Sponges- Circulate water through incurrent and deterrent pores Nematode- Digestive tract Open/Closed Circulatory- No distinction between extracellular and circulatory fluid this is called hemolymph Leaks out cell Once it’s out of circulatory system is called lymph No capillaries hemolymph Capillaries Blood + lymph
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Fish Heart and Circulation Two pumping chambers Low blood pressure past gills (no separate pulmonary circuit) Closed circulatory Once it leaves the heart first goes to gills where it unloads carbon dioxide to external
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