30.5 blood key concept blood is a complex tissue that transports materials
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30.5 Blood
KEY CONCEPT Blood is a complex tissue that transports materials.
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30.5 Blood
Blood is composed mainly of cells, cell fragments, and plasma.
• Whole blood is made up of different materials.– plasma– red blood cells – white blood cells – platelets
red blood cells,white blood cells,and platelets
plasma
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30.5 Blood
• Plasma is a key factor in maintaining homeostasis. – molecules diffuse into and out of plasma– contains proteins that stabilize blood volume– contains clotting factors – contains immune proteins
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30.5 Blood
Platelets and different types of blood cells have different functions.
• The bone marrow manufactures most of the blood components.
red blood cell
platelet
white blood cell
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30.5 Blood
• Red blood cells make up 40-45 % of all blood cells.– transport oxygen to cells and carry away carbon dioxide– have no nuclei and contain hemoglobin
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30.5 Blood
• White blood cells fight pathogens and destroy foreign matter.
red blood cell
platelet
white blood cell
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30.5 Blood
• Protein markers define blood types and Rh factors.
– ABO blood group the most common
– Rh factor can be negative or positive– blood types must be compatible for transfusions
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30.5 Blood
• Platelets help form clots that control bleeding.
platelets
fibrin
red blood cell
white blood cell