Nerve impulse | NMDCAT 2021

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About This Video ........................

In This Video Lecture You Will Learn Basic Concept Of Nerve Impulse
Nerve impulse is a wave of electrochemical changes, which travels along the length of the neuron
charge between the inner and the outer surface of a non-conducting neuron is called the resting
every two K+
surrounding luid, sodium (Na+
tenfold higher in concentration outside than inside the membrane surface, whereas potassium ions
more negative than the outside ofthe cell membrane o f neurons.
that are actively transported inward, three Na+
membrane potential. The major factors which are involved in resting membrane potential are:
are twenty times more concentrated inside than outside. All the neurons have very active sodium
This makes the inside of neuron membrane more negative.
1. Sodium and potassium ions:Of the many kinds of ions present in the nerve cells and the
of this positive ion from the neuron by difusion accounts for more negative’charges inside than
3. Leakage of K+ ions from neurons: The cell membrane is virtually impermeable to all ions
are much more inside the membrane than outside, where they are only in negligible concentration.
out and K+
is a measure of the capacity to do electrical work. It represents a type of stored energy which is
potential that exists across a cell membrane is known as membrane potential. A typical neuron
except K+. Since the membrane is slightly permeable to K+, some of it leaks out of the cell. The loss
outside the cell membrane of neuron.
are pumped out. So inside becomes
involving chemical reactions and movement of ions across the cellmembrane. Electrical potential
) and potassium (K+
and potassium pumps located in their cell membranes. Driven by the splitting of ATP, these pumps
2. Negative organic ions:The large negative organic ions (such as proteins, organic acids etc)
at rest is more positive electrically outside than inside the cell membrane. This net diference in
into the cell, both against their respective concentration gradients. For
transport Na+
) ions are the most important. Sodium ions are
manifested during separation of charges across a barrier. In the case of neuron, the charges are
positive and negative ions, and the charge separating barrier is the plasma membrane. The electrical
4. No conduction of nerve impulse

About This Channel.....................

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NMDCAT PART 1:    • New 1st Year Biology  

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