Physiology Chapter 8 Mastering A&P questions with correct answers

During an action potential, activation of voltage-gated sodium and potassium channels occurs at different rates. What is the effect of this difference on ion flow across an axon membrane? - Answer Initially, Na+ flows into the cell followed by K+ flowing out of the cell. Which of the following neurons or groups of neurons are NOT considered to be a part of the efferent pathway? - Answer sensory The neurons of the central nervous system are also known as ________. - Answer interneurons Which glial cells form myelin in the central nervous system? - Answer oligodendrocytes Why are Na+, K+, and Cl- the only ions considered in the GK equation when calculating resting membrane potential (Vm)? - Answer These are the ions to which cell membranes are permeable at rest. What would happen to the membrane potential if a resting cell suddenly becomes more permeable to Na+? - Answer It would depolarize. Neurotransmitters are usually released into synapses by __________. - Answer exocytosis Whether or not a neuron produces an action potential at a given moment depends on ________. - Answer the total potential chang