BIOL273 Lecture : Chapter 3 textbook material only Chapter 3 text material
16 Oct 2011
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Advantages of compartments: separate biochemical processes that might conflict, ex. protein synthesis and protein degradation. Disadvantages of compartments: barriers between compartment make it hard to move materials from one compartment to another, over power this by membrane transport systems. Major body cavities: cranial (skull), thoracic (thorax), and abdominopelvic lined with tissue membranes (fig 3-1: cranial. Contains brain primary control centre: thoracic. Bounded by spine and ribs (top and sides) Between peritoneum and muscles of the back. Pelvis contains reproductive organs, bladder, terminal end of large intestine. The lumens of some organs are outside the body. E. coli lives in our intestine, but is only harmful if it passes the organ wall into the body"s internal environment. Two main compartments (three compartments icf, plasma, interstitial) Intracellular fluid (icf) within cells: extracellular fluid (ecf) outside cells (fig 3-2) Plasma: fluid portion of blood, lies within the circulatory system and forms one ec compartment. Interstitial fluid: lies between circulatory system and cells.
