ASCI 438 Chapter 11: The Blood: Outline
19 Jun 2016
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The hematocrit represents the packed cell volume of blood; plasma accounts for the rest of the volume: 8% of the total body weight, made up of. Erythrocytes (more than 99% of the cells in blood) Platelets/ thrombocytes (cell fragments: all suspended in liquid plasma. Ion function: membrane excitability, osmotic distribution of fluid b/w the ecf and cells, buffering ph s: plasma proteins = 6-8% of the plasma weight, organic substance, nutrients, waste products, dissolved gases, and hormones. Many of the functions of plasma are carried out by plasma proteins: plasma proteins: Establish an osmotic/oncotic gradient to maintain plasma volume ph buffer three groups. Abundant; contribute most to oncotic pressure; nonspecifically bind poorly-soluble substances. Specifically bind and transport h2o insoluble substances; includes clotting factors and inactive precursor molecules: alpha: angiotensinogen, beta: blood clotting factors. The structure of erythrocytes is well-suited to their main function of o2 transport in the blood: erythrocyte structure.
