NEURON FUNCTION COMPREHENSIVE
WORKSHEET QUESTIONS AND
SOLUTIONS UPDATED STUDY RESOURCE
◉ Which of the gated embedded proteins in Model 1 allow sodium
ions ( O ) through the membrane?
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?
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?
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.
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 do sodium ions move
through the voltage-gated embedded proteins?
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?
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?
Answer: potassium ions move out of the cell when the potassium
gates are opened
WORKSHEET QUESTIONS AND
SOLUTIONS UPDATED STUDY RESOURCE
◉ Which of the gated embedded proteins in Model 1 allow sodium
ions ( O ) through the membrane?
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?
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?
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.
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 do sodium ions move
through the voltage-gated embedded proteins?
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?
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?
Answer: potassium ions move out of the cell when the potassium
gates are opened
