HLSC-128 Chapter Notes - Chapter 8: Vise, Oncotic Pressure, Red Blood Cell
20 Sep 2016
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Hlst 128: lecture notes + supplemental cpt. 8 textbook notes. Human physiology: from cells to systems (3rd canadian ed. In some cases, only one red blood cell can pass through at a time: many in the body. Extensive branching: the area where nutrients, oxygen and other components are exchanged between blood and surrounding tissues. Constant exchange: flow of blood through the capillaries is based on metabolic needs. Small muscle cells called precapillary sphincters cover sections of capillaries in order to control blood flow through constriction or relaxing. An increase in blood flow through out the body to satisfy: two types of passive exchange (do not require energy) metabolic demands. Molecules moving from areas of high concentration to low concentration (down a concentration gradient) Glucose, amino acid, and k+ pass in this manner between epithelial cells (pores) because they are water soluble. Lipid soluble substances such as gasses (o2 and co2) can pass though the epithelial cells themselves.
