blood. circulatory system (blood & vessels) 4 functions –1. transportation system for body...
TRANSCRIPT
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Blood
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Circulatory system (blood & vessels)•4 functions
–1. Transportation system for body
–2. Fights infection–3. Maintains water balance
–4. Maintains temperature
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What does blood do for us?
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What does blood do for us?
•Transports: –Nutrients–Wastes–Body heat
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Bloody facts•Only fluid tissue•5-6 liters in healthy male•8% of body weight
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I. Parts of blood•Red and white blood cells
floating in fluid called plasma
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4 ComponentsA. Red Blood Cells:
“Erythrocytes” •Transports oxygen•Make up 45% of bloodcalled
“hematocrit”
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A. Erythrocytes (RBC’s)•no nucleus •donut shape•Major factor in blood
thickness
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More bloody facts•RBC’s:
–Cannot multiply (why?)–Fall apart in 100-120 days–Remains gotten rid of by spleen and liver
No nucleus
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RBC’s continued
•Hemoglobin: What is it?
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Hemoglobin•Iron containing protein,
transports O2, can also bind to carbon dioxide and carbon monoxide
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Don’t write this slide!
•1 RBC contains ~250 million hemoglobin molecules
•Each h-molecule can bind 4 Oxygen molecule.
•1 RBC can carry ~1 billion oxygen molecules!!
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B. Leukocytes: White blood cells
- protects body- ~1% of blood
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•Able to leave blood vessels unlike RBC’s.
•Function: can locate areas of damage by responding to chemicals.
•Moves by ameoboid motion
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•Total WBC count is used to indicate infection- have more if you are sick
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C. Platelets: cell fragments - used in clotting
- ~1% of blood
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D. Plasma: non-living fluid- 55% of blood
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components
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What makes blood red?
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What makes blood red?
•Amount of oxygen it carries- Bright red when lots of
oxygen- Dull red when little O2
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Where does blood come from?
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Where does blood come from?•Hematopoeisis: blood cell
formation•Occurs in red marrow
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In adults, blood formed:
•Flat bones of skull and pelvis
•Ribs, sternum•Ends of long bones
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The end!!