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Circulatory System Functions
- Distributes nutrients
- Protection against injury and toxins
- Waste products transport
- Temperature regulation
- Exchange O2 and CO2
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Circulatory system in animals
- A. Open Circulatory system
- -no blood, no true heart
- -insects
- B. Closed Circulatory system
- -blood vessels, 2 and 4 chambered heart.
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Human Circulatory System (Flow)
- Right ventrical- oxygen poor blood-pumps to lungs via pulminary artery
- Pulminary artery
- Capillaries in lungs deposit CO2 and gather O2 goes back to heart
- Pulminary vein
- O2 rich blood enters heart via LA and then LV
- LV
- Aorta pumps O2 rich blood to body
- Capillaries deposit O2 and Gather CO2
- Vena Cava brings blood back to heart
- Right Atrium transport to Right Ventrical
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Arteries transport blood...
away from heart
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Veins transport blood..
to heart
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Blood Vessels (3 types)
- 1. Artery- pump blood away from heart (thick tissue)
- 2. Vein- pump blood to heart (thin tissue)
- 3. Capillaries- 1 cell thick exchanges O2 and CO2
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Blood (made up of)
- Cells suspended in liquid
- 1. Plasma--90% water
- -electrolytes
- -nutrients, waste products, hormones
- -proteins (antibodies, clotting, water balance)
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Cells (3 types)
- a. Enthocytes (red blood cells)
- b. Leukocytes (white blood cells)
- c. Platelets (cell fragments of bone marrow)
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Enthocytes (red blood cells)
- greatest number
- No Nucleus
- Produced by bone marrow
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Leukocytes (white blood cells)
- fight bacteria and infection
- mobile (move in and out of vessel)
- produced by bone marrow
- Contain Nucleus
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Platelets (cell fragments of bone marrow)
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Conditions of Circulatory System
- Anemia- low count of red blood cells (constantly tired)
- EPO- hormone that stimulates red blood cell production
- -athletes- inject EPO, blood doping
- Leukemia- Cancer of white blood cells
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Cardiovascular Disease
- Atherosclerosis- blockage of blood vessels
- -Heart attack- block arteries that feed the heart
- -Stroke- blocked artery that feeds brain
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Cardiovascular Disease (treatment)
- angioplasty- tiny catheter with balloonn inserted and inflated to compress plaque
- Bypass- vessels from leg used as detour around blocked vessels
- Stent- mesh wire props open vessel
- Transplant
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