Why can nerve impulses travel only in one direction?
Because of the chemical nature of impulse and the axon-dendrite structure.
Because of the chemical nature of impulse and the axon-dendrite structure.http:// (Best technical explanation and excellent graphics and animations)
The best generic answer from a 2008 post follows (with my own edits for clarity):
A Nerve electrical impulse only travels in one direction. There are several reasons nerve impulses only travel in one direction. The most important is synaptic transport.
In order for a “nerve impulse” to pass from cell to cell, it must cross synaptic junctions. The nerve cells are lined up head to tail all the way down a nerve track, and are not connected, but have tiny gaps between them and the next cell. These tiny gaps are called synapses.
When you get a nerve firing, you have probably heard that it is an electrical impulse that carries the signal. This is true, but it is not electrical in the same way your wall outlet works. This is electrochemical energy. Neurotransmitters are molecules that fit like a lock and key into a specific receptor. The receptor is located on the next cell in the line. When the neurotransmitter hits the receptor on the next cell in line, it signals that cell to begin a firing as well.
This will continue all the way down the length of the nerve track. In a nutshell, a nerve firing results in a chain reaction down the nerve cell’s axon, or stemlike section. Sodium (Na+) ions flow in, potassium (K+) ions flow out, and we get an electrochemical gradient flowing down the length of the cell. You can think of it as a line of gunpowder that someone lit, with the flame traveling down the length of it. Common electrical power is more like a hose full of water, and when you put pressure on one end, the water shoots out the other.
Therefore, nerve impulses cannot travel in the opposite direction, because nerve cells only have neurotransmitter storage vesicles going one way, and receptors in one place.
https://answers.yahoo.com/question/index?qid=20080916232931AA4zPLL
Calculate the price of your order
Select your paper details and see how much our professional writing services will cost.
- Freebies
- Format
- Formatting (MLA, APA, Chicago, custom, etc.)
- Title page & bibliography
- 24/7 customer support
- Amendments to your paper when they are needed
- Chat with your writer
- 275 word/double-spaced page
- 12 point Arial/Times New Roman
- Double, single, and custom spacing
-
We care about originality
Our custom human-written papers from top essay writers are always free from plagiarism.
-
We protect your privacy
Your data and payment info stay secured every time you get our help from an essay writer.
-
You control your money
Your money is safe with us. If your plans change, you can get it sent back to your card.
How it works
-
1
You give us the detailsComplete a brief order form to tell us what kind of paper you need.
-
2
We find you a top writerOne of the best experts in your discipline starts working on your essay.
-
3
You get the paper doneEnjoy writing that meets your demands and high academic standards!
Get your own paper from top experts
Order nowPerks of our essay writing service
We offer more than just hand-crafted papers customized for you. Here are more of our greatest perks.
Frequently asked questions
Get instant answers to the questions that students ask most often.
See full FAQWhat if I’m dissatisfied with the paper I get?
The average quality score at our professional custom essay writing service is 8.5 out of 10. The high satisfaction rate is set by our Quality Control Department, which checks all papers before submission. The final check includes:- Compliance with initial order details.
- Plagiarism.
- Proper referencing.
I need an essay on the same day. Is it something you can do?
Sure. Our writing company offers a fast service with an 8-hour deadline for orders up to master’s level. Make sure to specify the deadline in the order form and our writers will write a paper within the indicated timeslot. Just proceed to submit your requirements here Once you order a custom-written essay, our managers will assign your order to the well-suited writer, who has the best skills and experience for preparing your specific assignment. You can also request one of these extra features:- Choose the Writer’s Samples option – study 3 randomly-provided pages from orders that have been written by the assigned writer.
- Request a specific writer – choose an academic writer from the dropdown list in the order’s form (optional for returning customers).
How can I be sure your writing service is not a scam?
We understand that a shade of mistrust has covered the paper writing industry, and we want to convince you of our loyalty. Apart from high-quality writing services, we offer:- The chances of students to boost writing skills in a quick and effective way.
- The opportunity to manage studies and free time in an enjoyable manner.
- The possibilities to improve overall academic performance.
Is it legal to use your professional writing service?
Yes. Custom writing help is not prohibited by any university or college. It’s a 100% legal way of getting professional assistance with paper writing. Hiring writers from an essay writing company is in many ways similar to consulting a tutor – we help you solve the writing issues at hand.How does your service work?
Our custom writing service is a reliable solution on your academic journey that will always help you if your deadline is too tight. You fill in the order form with your basic requirements for a paper: your academic level, paper type and format, the number of pages and sources, discipline, and deadline. Then, you describe the specific details of the paper you need: add the topic, write or paste the instructions, and attach files to be used, if you have them. After that, an online customer support representative chooses the best writer that specializes in your discipline and assigns him or her to complete the paper according to your requirements. When the paper is ready, we check it for plagiarism and send it to you. If you want to change something, you can request a free revision.