Depolarization of neuronal plasma membrane
How depolarization of the neuronal plasma membrane is produced? How does the cell come back to its original rest?
Expert
Whenever neuron receives a stimulus through the binding of the neurotransmitters to the exact receptors sodium channels open and the permeability of plasma membrane in postsynaptic region is changed. Then sodium ions enter in the cell resulting in the lowering of the membrane potential. In case, this reduction of the membrane potential arrives at a level known as the excitation threshold, or threshold potential, which is around–50 mV, the action potential is produced, that is, the depolarization intensifies up-till reaching its higher level and depolarization current is transmitted all along the remaining length of neuronal membrane. In case, the excitation threshold is attained voltage-dependent sodium channels within the membrane open enabling more sodium ions to go into the cell in favor of concentration gradient and an estimated -35 mV level of positive polarization of the membrane is attained. Then the voltage-dependent sodium channels close and more voltage-dependent potassium channels get open. Then the potassium ions go out through the cell in favor of concentration gradient and potential difference of the membrane reduces, a method known as repolarisation. The action potential triggers the similar electrical mechanism in the neighboring regions of plasma membrane and the impulse is therfore transmitted from dendrites to terminal region of the axon.
State the relation between thyroid and the hypophysis?
Illustrate the two main groups into which fishes are classified?
Specify the two reproductive novelties of beings of class Reptilia which allow for the survival within the dry environments?
Explain different types of the gas exchange which occurs in animals?
Which cell division process is directly related to the embryonic growth?
This is often resorted to by the management for messages that are lengthy and have to be made permanent. It is also undertaken when oral communication cannot reach each and every person concerned, either due t a large number of communications or due to long geographical distances between the send
How does the substrate concentration influence the speed of enzymatic reactions?
How are bacteria categorized according to the production of organic material for energetic metabolism?
Perception is also influenced by the status of the perceiver. Higher status people can exert greater influence on perception of an employee than low status people.
State the difference between exocrine gland and the endocrine gland?
18,76,764
1951094 Asked
3,689
Active Tutors
1459044
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!