BIO 181 ASU EXAM 3 Short Answers

BIO 181 ASU EXAM 3 Short Answers Briefly explain why the action potential flows only from the axon hillock to the terminal web. - CORRECT ANSWER-The action potential originates from the axon hillock which initiates the flow of the action potential because of the presence of higher density voltage-gated ion channels. List the 4 types of glial cells and list a phrase to describe their function. - CORRECT ANSWER-- Microglia: cleans up cellular debris - Astrocytes: support and repair neurons - Schwann Cells: myelinates axons of the neurons in the PNS - Satellite: form the brain-blood barrier within the CNS How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? - CORRECT ANSWER-The cell wraps extensions of a fatty insulating substance (myelin) around the axons of neurons. What could the stress of taking an exam do to your glucose levels in various parts of the body? - CORRECT ANSWER-It can raise the glucose levels in your blood When epinephrine is released it triggers activation of which part of the Autonomic Nervous System? - CORRECT ANSWER-The adrenal medulla, which then triggers the hypothalamus Where do fats in the body play a role in balance between glucose and glycogen - CORRECT