CHAPTER 11: NERVOUS SYSTEM (q and a) 3.0

False

False

True

<p>True</p> Signup and view all the answers

<p>True</p> Signup and view all the answers

<p>False</p> Signup and view all the answers

<p>synapse</p> Signup and view all the answers

<p>Spatial summation = many presynaptic terminals are usually stimulated at the same time Diverging pathway = The axon from one neuron divides and synapses w/ more than one other neuron Temporal summation = Successive discharges from a single presynaptic terminal Converging pathway = 2 or more neurons synapse w/ the same neuron</p> Signup and view all the answers

<p>action potential = At the end of repolarization, the charge on the cell membrane briefly becomes more negative than the resting membrane potential (hyperpolarization). Potassium ions = Increased in extracellular concentration decreases the concentration gradient Absolute = Complete insensitivity Relative = A strong stimulus or stronger than threshold can initiate another action potential during this period</p> Signup and view all the answers

<p>Action Potential Chracteristics = Can propagate, or travel, across the plasma membrane Graded Potential = They vary in size depending on the strength of the stimulus. Sodium ions = As sodium ions diffuse into the cell the inside becomes more positive Chloride ions = Inside of the cell becomes negative with entry of chloride ions, causing hyperpolarization.</p> Signup and view all the answers