APB Neuron Function
Neuron Function
How does a signal travel across and between neurons?
Why?
Just as the coaxial cables that run down your street or
... [Show More] through your house carry television and Internet
signals, the job of a neuron is to move an electrical signal from one place to another in order to send sensory
messages throughout the body. In a previous activity you saw how a membrane potential is formed
both at rest and during an inflow of ions. In this activity you will explore how changes in membrane
potentials can propagate a signal down the axon of a neuron.
1. Which of the gated embedded proteins in Model 1 allow sodium ions ( ) through the membrane?
2. Which of the gated embedded proteins in Model 1 allow potassium ions ( ) through the membrane?
3. The neuron illustrated in Model 1 has received a signal from either a sensory cell (taste bud, skin
cell, retinal cell, etc.) or from another neuron. What evidence do you find in diagram 1 of the
model that indicates a signal has been received?
4. In diagram 2 of Model 1, gated embedded protein B has opened. Was this opening triggered by
the arrival of a signal ligand? If no, propose an alternate stimulus that might have triggered the
gate to open.
5. Consider Model 1.
a. When a signal moves down the axon of the neuron, which direction do sodium ions move
through the voltage-gated embedded proteins?
b. What does the movement of sodium ions across the membrane do to the membrane potential
near the open embedded protein?
6. Consider Model 1.
a. When a signal moves through the axon of the neuron, which direction do potassium ions
move through the voltage-gated embedded proteins?
b. What does the movement of potassium ions across the membrane do to the membrane potential
near the open embedded protein?
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