(Solved): Draw It: Ion Gradients and lon Movements Following is an illustration of a plasma membrane with sod ...

Draw It: Ion Gradients and lon Movements Following is an illustration of a plasma membrane with sodium and potassium ion channels (Figure 11.4). Draw the odium and potassium ions in the correct distribution for a resting cell. Then, draw an arrow to show in which lirections the ions will diffuse when the channels have opened. K leak channel Plasma membranc Figure 11.4 The plasma membrane of an excitable cell. Complete It: Changing the Membrane Potential value called Fill in the blanks to complete the following paragraph that walks through what happens when we open and close ion channels to change the membrane potential of a neuron. A small, local change in the membrane potential of the neuron is called a one of two effects: It may make the membrane more positive, a change called membrane potential more negative, a change called K leak channel ions; (2) continued outflow of This event has three phases in a neuron: (1) mediated by the outflow of Na' leak channel ions. channels open, initiating an event known as an , or it may make the If a positive change in membrane potential reaches a It may have , mediated by the influx of ions; and (3) mediated by the