Neuron Structure and Function POGIL Quiz

Neuron Structure and Function POGIL Quiz list the parts of the neuron (be able to label them too) - cell body/soma cell nucleus dendrites axon synapse what are the parts of a neuron membrane? - phospholipid layer, embedded proteins, sodium/ potassium pump, K+, Na+, and ATP/ ADP which side of the membrane has more sodium ions when the neuron is at rest? - the outside of the cell why cant sodium ions cross the membrane without the use of a protein channel? - the sodium ions are polar whereas the phospholipid layer is nonpolar. the protein channel is surrounded by polar groups that allow the sodium ions to move through. which direction should the sodium ions flow naturally if a channel is provided? - into the cell which side of the membrane has more potassium ions at resting potential? - the inside of the cell which direction should potassium ions flow if a channel is provided? - out of the cell when activated, which direction do sodium ions flow through the cell? - out of the cell what is the ratio of sodium ions to potassium ions moved through the s/p pumps each cycle? - 3 Na+ : 2 K+ what will eventually happen if the sodium/ potassium pumps were to stop working? - the concentration of the membrane would reach equilibrium (bad) what is the resting potential of a neuron? - -70mV what must happen in order for the ligand-gated channel to open? - a signal ligand must bind to the protein and change its shape true or false? the shapes of some proteins are dependent on the electrical potential in the surrounding area. - true what is one factor of the membrane potential? - the relative number of positive and negative ions on each side of the membrane and the properties of the ion channels themselves when the ligand-gated protein is open, what flows through? - sodium ions in the ligand-gated channels, are the ions moving with or against the original concentration gradient? - with the concentration gradient what is the job of a neuron? - to move an electrical signal from one place to another in order to send sensor messages throughout the body when a signal moves into the cell, which direction do sodium ions move through the voltage- gated embedded proteins? - sodium ions move into the cell what does the movement of sodium ions across the membrane