Depolarization of neuronal plasma membrane
How is the depolarization of neuronal plasma membrane produced? How does the cell return to its original rest?
Expert
When the neuron gets a stimulus by the binding of neurotransmitters to particular receptors sodium channels open and the permeability of plasma membrane in the postsynaptic region is changed. Sodium ions then go in the cell causing lowering (less negative) of membrane potential. If this reduction of membrane potential reaches a level called excitation threshold or threshold potential, about –50 mV, action potential is generated, that is, the depolarization intensifies till reaching its maximum level and depolarization current is transmitted along the remaining length of neuronal membrane.
If excitation threshold is reached voltage-dependent sodium channels in membrane open allowing more sodium ions to enter cell in favor of the concentration gradient and an estimated –35 mV level of positive polarization of the membrane is accomplished. The voltage-dependent sodium channels then close and more voltage dependent potassium channels open. Potassium ions then exit the cell in favor of the concentration gradient and the potential difference of the membrane diminishes, a process named as repolarization.
The action potential triggers the same electrical phenomenon in neighboring areas of plasma membrane and impulse is therefore transmitted from dendrites to terminal region of the axon.
Give a brief description of the term mutualism?
Safety Training: It is an effective training program which reduces the number of injuries and deaths, legal liability, property damage, illness, workers' compensation claims, and missed time from work. The safety training will too help in raising the
Optimization: Finding an option with the most cost efficient or highest attainable performance beneath the given constraints, by maximizing preferred factors and diminishing undesired ones. In comparison, maximization means trying to achieve the highe
State the chemical equation explaining the formation of bicarbonate from the carbon dioxide and water? What enzyme is responsible for catalyzing this reaction?
Explain the fundamental morphology of the protozoan cell?
1) Is a given factor and input or an outcome? For example, "responsibility" is viewed by some as input and as output by others. 2) How does a person choose (or change) the comparison other? 3) Under what circu
Elements of scientific management The main elements of scientific management are : i) work study involving work measurement and work improvement thr
What do you mean by immunolabeling?
Difference among a partner and a customer:If take reference of SRM then, In SRM all of the stake holders are partners. For example vendor, employees etc.
Recommendations for improvement: Clear and precise communication should be used in the organization. Training sessions and improvement should be based by arranging different sessions to make the employees well prepared. Discover Q & A Leading Solution Library Avail More Than 1440083 Solved problems, classrooms assignments, textbook's solutions, for quick Downloads No hassle, Instant Access Start Discovering 18,76,764 1930180 Asked 3,689 Active Tutors 1440083 Questions Answered Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!! Submit Assignment
18,76,764
1930180 Asked
3,689
Active Tutors
1440083
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!