Blood Composition - Cabrillo Collegepdarcey/Bio 4/Fall 2011/Class Notes...• = about 55% of the blood • Composition ... • cytoplasm Produced by leukopoiesis in red bone marrow
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Blood
Chapter 19
Introduction • Functions
– Transport medium – Regulation – Protection
• Composition – Plasma – fluid – Formed elements – cells & cell fragments
• Differences between plasma and intersititial fluid – Plasma has more dissolved gases – Plasma has more proteins – Concentrations of small molecules are similar
Plasma Proteins
• Most are made by the liver – Albumins – transport fatty acids & steroids – Globulins – immune functions – Fibrinogen – blood clotting
Formed Elements • Blood cells and cell fragments • Produced by hemopoiesis
– Arise from stem cells called hemocytoblasts • Types of formed elements
– Erythrocytes – red blood cells (RBCs) – Leukocytes – white blood cells (WBCs) – Thrombocytes – platelets