BILD 2 Midterm: BILD 2 MIDTERM ONE REVIEW: STUFF SAID IN LECTURE
Document Summary
Negative feedback: the response reduces the stimulus to bring back to normal range , stimulus causes response to decrease that stimulus. Positive feedback: stimulus causes response that enhances stimulus(not homeostatic) ex: oxytocin and giving birth. Cells unable to respond to insulin (insulin-resistant) high low high high. Overproduction of insulin low low low high high low low low low high high. Composed of two major types of cells: glia- glue . Axon terminal- receives action potentials and stores neurotransmitters. Synaptic cleft- where neurotransmitters are released from presynaptic cell into the postsynaptic cell. Ion gradients control electrical signaling by depolarizing the cell: More na+, ca2+, cl- outside the cell so open channels will cause them to go into the cell. More k+ inside the cell so open channels will cause it to leave the cell. The resting membrane potential of the cell is -70mv (determined by nernst equation) Na+/k+ pump- one protein pumps 3 na+ out and 2 k+ in.
