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 and function of the 'brain' relate to specific behavioural and psychological processes. Often neuropsychologists are employed as scientists to advance scientific or medical knowledge. Neuropsychology is particularly concerned with the understanding of brain injury in an attempt to work out normal psychological function. The approach of cognitive neuroscience to studying the link between brain and behaviour is to use neuroimaging tools, such as to observe which areas of the brain are active during a particular task. Cognitive psychology The nature of thought is another core interest in psychology. Cognitive psychology studies cognition, the mental processes underlying behaviour. It uses information processing as a framework for understanding the mind. Perception, learning, problem solving, memory, attention, language and emotion are all well researched areas. Cognitive psychology is associated with a school of thought known as cognitivism, whose adherents argue for an information processing model of mental function, informed by positivism and experimental psychology. Cognitive science is a conjoined enterprise of cognitive psychologists, neurobiologists, workers in artificial intelligence, logicians, linguists, and social scientists, and places a slightly greater emphasis on computational theory and formalization. Both areas can use computational models to simulate phenomena of interest. Because mental events cannot directly be observed, computational models provide a tool for studying the functional organization of the ... (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
17,602,210 questions answered
Popular Conversations
A list of potential sources of information for a paper is a(n) ...
Weegy: A list of potential sources of information for a paper in annotated bibliography. User: An index to ...
9/29/2014 2:50:04 PM| 4 Answers
You've settled on an idea for an essay to write. What should you do ...
Weegy: D.) Conduct interviews, do some research, ask questions, and make a plan. User: To make sure your reader ...
9/29/2014 5:55:28 PM| 4 Answers
What is the square root of 6000?
9/29/2014 2:39:45 PM| 3 Answers
Because the subject of a composition is like a crystal with many ...
Weegy: Because the subject of a composition is like a crystal with many facets, you should A. offer your reader ideas ...
9/29/2014 7:06:34 PM| 3 Answers
The densest ocean water is generally found a. in the surface ...
Weegy: A. in the surface zone User: In which zone is ocean temperature most affected by the weather? a. transition ...
9/30/2014 6:07:25 AM| 3 Answers
The pressure of ocean water increases as depth increases. User: The ...
Weegy: It originates in the Gulf of Mexico and, as the Florida Current, passes through the Straits of Florida and then ...
9/30/2014 6:27:02 AM| 3 Answers
In the Roman Republic, ____________ did not have power in the ...
Weegy: In the Roman Republic,non-citizens did not have power in the government.
9/29/2014 5:48:03 AM| 2 Answers
Weegy Stuff
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
P
C
L
Points 3316 [Total 27714]| Ratings 8| Comments 3236| Invitations 0|Offline
S
L
1
L
P
C
1
Points 2951 [Total 9482]| Ratings 12| Comments 2831| Invitations 0|Offline
S
L
P
C
L
P
C
P
C
L
P
C
P
C
P
C
Points 2747 [Total 19919]| Ratings 12| Comments 2627| Invitations 0|Offline
S
L
C
P
C
1
L
L
P
C
1
Points 2739 [Total 18678]| Ratings 18| Comments 2559| Invitations 0|Online
S
L
1
1
1
1
L
1
L
Points 2594 [Total 12374]| Ratings 0| Comments 2594| Invitations 0|Offline
S
1
L
1
L
P
P
L
Points 968 [Total 12214]| Ratings 0| Comments 968| Invitations 0|Offline
S
L
P
C
P
C
1
L
P
C
L
P
C
P
C
P
C
P
C
Points 864 [Total 19395]| Ratings 2| Comments 844| Invitations 0|Offline
S
L
Points 733 [Total 1402]| Ratings 0| Comments 733| Invitations 0|Offline
S
1
L
L
Points 652 [Total 5775]| Ratings 5| Comments 602| Invitations 0|Online
S
P
C
L
P
L
1
Points 176 [Total 6233]| Ratings 2| Comments 156| Invitations 0|Offline
Home | Contact | Blog | About | Terms | Privacy | Social | ©2014 Purple Inc.