Cardiovascular system:blood chapter 14
Terms
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- Describe blood according to its tissue type
- Blood is a connective tissue whose cells are suspended in liquid called plasma.
- Describe major function of blood.
- Functions of blood include transporting substances between body cells and the outside, maintaining homeostasis and protection.
- Define the term hematology
- Hematology is the study of blood, blood-forming tissues and the disorders that affect them.
- Name the average volume of blood in a human.
- Blood volume varies from individual to individual, but the average volume (70 kg male) is 5 liters.
- Name the two major components of blood and the percentage of each by weight.
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Solid cells or "formed elements" (45%), which is composed mainly of red blood cells.
a. Quantitation of this portion of blood represents the hematocrit (HCT) reading or packed cell volume (PCV).
Liquid plasma (55%), which contains water, electrolytes, hormones, wastes, proteins and much more - Name the three types of human blood cells
- red blood cells, white blood cells, and platelets
- Provide the common and scientific name for each blood cell type.
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Red Blood Cells (RBC) = Erythrocytes
White Blood Cells (WBC) = Leukocytes
Platelets = thrombocytes - Hemoglobin
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Hemoglobin is broken into globin and heme,
Iron in Hb is recycled,
Heme is broken into biliverdin > bilirubin > bile. - Why do mature cells lack nuclei?
- are anucleate, leaving more room for hemoglobin/oxygen;
- RBC Count
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The number of rbc's/mm3 blood.
Average RCC = 4 million-6 million rbc's/mm3 - Average life-span of RBC's
- 120 days
- What destroys RBC's
- Liver and spleen macrophages destroy worn rbc's
- Production (Erythropoiesis) of RBC's
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In fetuses = yolk sac, liver, spleen;
In adults = red bone marrow;
B12, folic acid, and iron are all needed.