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2nd half lecture notes

2nd half lecture notes - Lectures 23:16 LECTURE...

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Lectures 23:16 LECTURE 1- 2/8/10 Everything we talk about in biology is about homeostasis. If it is not maintained, the  organism dies.  Everyday you challenge your homeostasis. We don’t know what it is about sleep that is necessary, just that it is necessary. Homeostasis is maintaining a relatively constant state that’s very dynamic in nature. Not  static! Keep the change tolerable. Constantly responding to the environment. Canadian scientist- stress response  Put rats in fridge- they adapted, after months, they started dying Adrenal gland- helps respond to stresses. When you’re stressed for a long period of  time, the adrenal gland gets larger. Releases adrenaline, corticoids. It gets smaller when  animal starts to fail. To deal with temperature, animals have behavioral and cellular changes. Cooling Glove Role of fluids in homeostasis Pink cells- epithelial cells, erythrocytes inside Edema- fluid is collecting in the interstitial extracellular space  Epithelial- inner liniing person of epitheal and so is outside portion of heart Squamous cells can generate for your lifetime Columnar epithelil- bacteria Cuboidal epithelial cells- cells that cn]
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All lininig of heart system Muscle- skeletal muscle characterized by striations Muscle fibers have a huge differencek depen Nuclei-muscle fibber, thousands of nuclei Cardiac cells- striated Different, much smaller and typically smaller,  myocytes Smooth muscle cells- under autonomic control. Gut/ digest food. Connective Tissue- connecive tissue- tendons, fascia, ligaments, bone are support  structures. Formed primarily by connective tissue. Blood cells are also connective tissue. A lot mor red blood cells than white blooood  cells. They carry oxygen Neuron ( Nervous Tissue) Pripocel- neurons Glia cellls- ex astrocyte. Do not transmit action transport.Some say if you did not have  astrocytes after an injury it would be better because they’re responsible for scar tissue. Organs and Homeostasis In most organs, all four tissues are represented. Most tissues operate between Q2 and Q3 Slide 31- 4 fundamental ways of losing heat In book, it says one of major energy generating functions in the transport of potassium  across membranes—this may not be true. Most important important source of  generating heat is by far the muscle. Small animals generate a lot of heat per kg body weight Relationship is function of surface area of body Smaller the animal the greater surface area to volume ratio, therefore greater loss of  heat and thus metabolic rate must be higher to compensate for heat loss.
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