Neuron function worksheet with complete solution
what is the job of a neuron Correct Answer- to move an electrical signal from one place to another in
order to send sensory messages throughout the body
Which of the ga
...
Neuron function worksheet with complete solution
what is the job of a neuron Correct Answer- to move an electrical signal from one place to another in
order to send sensory messages throughout the body
Which of the gated embedded proteins in Model 1 allow sodium ions ( O ) through the membrane?
Correct Answer- gates A, B, D and F allow sodium ions through the membrane
Which of the gated embedded proteins in Model 1 allow potassium ions ( triangles ) through the
membrane? Correct Answer- Gates C, E, and G allow potassium ions through the membrane
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? Correct Answer- A signal Ligand has bound to the
ligand-gated embedded protein and the gate has opened
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. Correct Answer- No, diagram 2 does not show a ligand bound to embedded protein B. The
gate may have opened because of the change in membrane potential from the flood of ions nearby
When a signal moves down the axon of the neuron, which direction sodium ions move
through the voltage-gated embedded proteins? Correct Answer- sodium ions move into the cell when
the sodium gates are opened
What does the movement of sodium ions across the membrane do to the membrane potential
near the open embedded protein? Correct Answer- the membrane potential increases (gets more
positive) as the sodium ions move into the cell
When a signal moves through the axon of the neuron, which direction do potassium ions
move through the voltage-gated embedded proteins? Correct Answer- potassium ions move out of the
cell when the potassium gates are openedWhat does the movement of potassium ions across the membrane do to the membrane potential near
the open embedded protein? Correct Answer- the membrane potential decreases ( gets more negative)
as the potassium ions move out of the cell
when a neuron is resting the cell membrane is said to be POLARIZED Correct Answerhow is the degree of polarization measured? Correct Answer- the degree of polarization is measured by
the cell membrane potential
the gated embedded proteins in the axon of a neuron are triggered to open by changes in electrical
potential across the membrane. Correct Answer- the voltage at which they open is called the threshold
potential
Looking at model 1
What is the threshold potential that causes the sodium ion gates to open? Correct Answer- the sodium
ion gates open at -55 mV
Looking at model 1
At what potential are the potassium ion gates fully open? Correct Answer- the potassium ion gate open
at +35 mV
looking at model 1
at what potential are the sodium ion gates closed Correct Answer- the sodium ion gates close when the
membrane potential reaches +35 mV
At what potential are the potassium ion gates closed?
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