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Topic: Circulatory systemAim: Describe the parts of the blood.
Do Now: Explain why you have blood in your body.
HW: Read pgs. 540- top of 545. Write down 10 bullets (in complete sentences).
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Blood
•Liquid tissue
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•Adult = about 5L
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PLASMA
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•Liquid part•Mostly made of water (90%)
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•Transports materials:–Salt, sugar, proteins–Wastes–Enzymes–Blood cells–Hormones
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Red Blood Cells
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•Most numerous•Disc shaped•Smaller than wbc’s
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•Made in bone marrow
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RBC’s are made at a rate of 2-3 million per second in the center of long bones like the femur in your thigh. They are
round and tiny. About 3,000 end to end would equal 1 inch. An average body contains about 25 trillion RBC’s.
That’s 600-700 times as many as white blood cells.
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•No nucleus when mature
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• Contain HEMOGLOBIN carries OXYGEN (& some CO2)
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White Blood Cells
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•Fight infection / disease
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•Made in bone marrow•Largest •Fewer than RBC’s
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An average adult’s body normally contains over 35 billion WBC’s. That’s
1 for every 600-700 RBC’s.
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Platelets
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•Cell fragments (cytoplasm surrounded by a membrane)
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•Made in bone marrow•Involved in BLOOD CLOTTING
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Blood Clotting
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A. Stick to edge of cut
Circulatory System: Blood Platelets
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B. Produce FIBRIN (long, sticky string) that sticks to cut vessel
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C. Web like complex of strands forms to stop bleeding CLOT
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D. Clot becomes hard & dry (SCAB)
E. Skin cells repaired under scab and scab falls off
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One grain of rice = 1 cubic mm5 million RBC’s5,000 – 10,000 WBC’s400,000 platelets
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Did you know…•In the US, a blood transfusion is
needed about every 2 seconds.•Plasma transfusions help patients
with liver disease, severe burns, hemophilia, and leukemia.
•About half of Americans can safely be blood donors, but only 5% of these people actually donate blood.
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Review: Identify the part of blood being described.
1. Most numerous blood cell.2. Carries enzymes.3. Involved in blood clotting.4. Carries oxygen.5. Largest blood cell.6. Made up of 90% water.7. Involved in blood clotting.8. Protect the body against disease.9. Carries hormones.
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