Exam (elaborations)
AP BIOLOGY NEURON FUNCTION POGIL
- Course
- Institution
AP BIOLOGY NEURON FUNCTION POGIL
[Show more]
Seller
Follow
verifiedtutors
Reviews received
Content preview
Neuron FunctionHow does a signal travel across and between
neurons?
Why?
Just as the coaxial cables that run down your street or 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 sen-sory 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?
Gates A, B, D and Fallow sodium ions through the membrane
2. Which of the gated embedded proteins in Model 1 allow potassium ions ( ) through the
membrane?
Gates C, E and G 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 themodel that indicates a signal has been received?
A signal ligand has bound to the ligand gated embedded protein and the gate has opened
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 thegate to open.
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.
5. Consider Model 1.
a. When a signal moves down the axon of the neuron, which direction do sodium
ions movethrough the voltage-gated embedded proteins?
Sodium ions move into the cell when the sodium gates are opened
b. What does the movement of sodium ions across the membrane do to the membrane
potentialnear the open embedded protein?
The membrane potential increases (gets more positive) as the sodium ions move into the cell
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?
Potassium ions move out of the cell when the potassium gates are opened
b. What does the movement of potassium ions across the membrane do to the membrane potent
near the open embedded protein?
The membrane potential decreases (gets more negative) as the potassium ions move out of the cell
1
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller verifiedtutors. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R211,38. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75619 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now