Question and answer
Describe briefly what a neuron is and how it works . How do hormones affect our chemical balance and behavior?
When a neuron is not sending a signal, it is "at rest." When a neuron is at rest, the inside of the neuron is negative relative to the outside. [ [ Although the concentrations of the different ions attempt to balance out on both sides of the membrane, they cannot because the cell membrane allows only some ions to pass through channels (ion channels). At rest, potassium ions (K+) can cross
through the membrane easily. Also at rest, chloride ions (Cl-)and sodium ions (Na+) have a more difficult time crossing. The negatively charged protein molecules (A-) inside the neuron cannot cross the membrane. In addition to these selective ion channels, there is a pump that uses energy to move three sodium ions out of the neuron for every two potassium ions it puts in. Finally, when all these forces balance out, and the difference in the voltage between the inside and outside of the neuron is measured, you have the resting potential. The resting membrane potential of a neuron is about -70 mV (mV=millivolt) - this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron. Action Potential The resting potential tells about what happens when a neuron is at rest. An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential. The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential. This is the threshold. If the neuron does not reach this critical threshold level, then no action potential will fire. Also, when the threshold level is reached, an action potential of a fixed sized will always fire...for any given neuron, the size of the action potential is always the same. ] ]
Question
Asked 4/30/2010 12:07:40 PM
0 Answers/Comments
Get an answer
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
If I have a general topical for my essay called Depression, then what would be a good narrowed topic
Weegy: You could focus on treatments for depression, how they work and success rates. (More)
Question
Expert Answered
Asked 4/28/2010 3:39:14 PM
0 Answers/Comments
Compare/Contrast two different schools of psychology, such as structuralism and functionalism.
Weegy: Biological psychology is the scientific study of the biological bases of behavior and mental states. Because all behaviour is controlled by the central nervous system, it is sensible to study how the brain functions in order to understand behaviour. [ This is the approach taken in behavioural neuroscience, cognitive neuroscience, and neuropsychology. Neuropsychology is the branch of psychology that aims to understand how the structure ... (More)
Question
Expert Answered
Asked 4/28/2010 6:25:38 PM
0 Answers/Comments
Compare/Contrast two different schools of psychology, such as structuralism and functionalism
Weegy: (More)
Question
Expert Answered
Asked 4/28/2010 6:31:53 PM
0 Answers/Comments
Which one makes more sense to you and why? Structuralism or functionalism
Weegy: You are here seeking answers, you are seeking validation about why people seem to avoid you and how to stop it from happening which indicates you are unsure and insecure if it has something to do with you (More)
Question
Expert Answered
Asked 4/28/2010 7:13:22 PM
0 Answers/Comments
Does structuralism or functionalism makes more sense and why?
Weegy: (More)
Question
Expert Answered
Asked 4/28/2010 7:40:42 PM
0 Answers/Comments
17,190,952 questions answered
Popular Conversations
Indicate whether the statement is true or false. The reason a penny ...
Weegy: TRUE - The reason a penny thrown straight up inside an airplane will come back to your hand is that you, the air ...
8/31/2014 3:31:31 PM| 4 Answers
A line passes through the points (-10, -4) and (-1,2). What is the ...
Weegy: A line passes through the points (-10, -4) and (-1,2). The y-intercept of the line is 8/3. The equation of the ...
8/31/2014 11:50:10 AM| 3 Answers
India is a subcontinent and consists of all of the following except. ...
Weegy: Indian subcontinent has all the features , valleys in himalayan mountains , deccan plateaus , thar desert , and ...
8/31/2014 11:02:13 AM| 2 Answers
Market economy. User: Command economy.
8/31/2014 8:31:19 PM| 2 Answers
Consider this quote: "In each of these historical instances . . . ...
Weegy: D. it stands for the omission of only a single word. User: Which of the following statements correctly ...
9/1/2014 8:30:28 AM| 2 Answers
Every set of three points is coplanar.
9/1/2014 7:59:14 PM| 2 Answers
Weegy Stuff
S
L
1
L
Points 136 [Total 6669]| Ratings 0| Comments 136| Invitations 0|Offline
S
L
C
P
C
1
L
L
Points 105 [Total 16044]| Ratings 0| Comments 105| Invitations 0|Offline
S
R
L
1
1
P
C
1
P
1
1
L
P
C
P
C
1
P
C
L
P
C
1
P
C
P
C
Points 96 [Total 24496]| Ratings 0| Comments 96| Invitations 0|Offline
S
L
1
1
1
1
L
1
Points 62 [Total 9842]| Ratings 0| Comments 62| Invitations 0|Offline
S
L
P
C
L
P
C
P
C
L
P
C
P
C
P
C
Points 46 [Total 17218]| Ratings 0| Comments 46| Invitations 0|Offline
S
L
P
C
P
C
1
L
P
C
L
P
C
P
C
P
C
P
C
Points 39 [Total 18570]| Ratings 0| Comments 39| Invitations 0|Offline
S
Points 20 [Total 20]| Ratings 0| Comments 0| Invitations 2|Offline
S
1
L
1
L
P
P
L
Points 19 [Total 11265]| Ratings 0| Comments 19| Invitations 0|Offline
S
Points 16 [Total 686]| Ratings 0| Comments 16| Invitations 0|Offline
S
P
C
L
P
L
1
Points 15 [Total 6072]| Ratings 1| Comments 5| Invitations 0|Offline
Home | Contact | Blog | About | Terms | Privacy | Social | ©2014 Purple Inc.