BIOM 3200 Chapter Notes - Chapter 1: Resting Potential, Axon Hillock, Nissl Body
16 Aug 2016
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Examples: body temperature, blood glucose concentration, the tension of a tendon. Sensors send information to an integrating center, which detects changes from a set point. Increasing activity of one effector is accompanied by a decreasing activity of an antagonistic effector. Effectors amplify the changes that stimulated the effector. ** homeostasis must ultimately by maintained by negative feedback, rather than positive. However, some positive feedback mechanisms amplify the actions of a negative feedback response. Prevention of further loss of blood= negative feedback loop. Estrogen secreted by ovaries stimulates secretion of lh, which trigger ovulation. Membrane potential- the difference in charge (or potential difference) Cellular proteins and phosphate (po4- from atp) are negatively charged at the ph of the cell cytoplasm. The anions are fixed within the cell because they cannot penetrate the plasma membrane. They attract cations from the extracellular fluid that can pass through the ion channels in the plasma membrane.
