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types of blood cells
- RBC (erythrocytes)
- WBC (leukocytes)
- platelets (thrombocytes)
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types of WBC
- nongrandular: lymphocyte & monocytes
- grandular: neutrophils, esinophils, & basophil
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blood types
- A+, A-
- B+, B-
- AB+, AB-
- O+, O-
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blood plasma definition
blood minus its cells
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blood plasma composition
water containing many dissolved substances (food, salts, hormones)
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blood plasma amounts
- varies w/size & sex
- 4-6L is about the average
- about 7%-9% of body weight
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blood count
- RBC: 4.5-5 million per mm3 of blood
- WBC: 5k-10k per mm3 of blood
- platelets: 300k per mm3 of blood
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what does red bone marrow do?
- (aka myeloid tissue)
- forms all blood cells except some lumphocytes & monocytes, which are formed by lymphatic tissue in lymph nodes, thymus, & spleen
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RBC structure
disk shaped w/no nuclei
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RBC functions
transport O2 & CO2
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anemia
inability of blood to carry adequate O2 to tissues
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anemia is caused by
- inadequate RBC numbers
- deficiency in hemoglobin
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Polycythemia
abnormally high RBC count
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hematocrit test
medical test where a centrifuge is used to seperate whole blood into formed elements & liquid fraction
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normal RBC level
about 15%
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