Action Potential

Monday, February 15, 2010 JS Hanniffy 8 Comments

As I’ve already posted in the communication with neurons; neurons receive signals through the dendrites, which is it can be received from another neurons or a sense organ. The Nucleus or nut is responsible for the production of ribosomes, small structures that are involved in protein synthesis. 

The nucleus makes a decision based on the information it gets through the dendrites. This information derives from ribonucleic acid message (mRNA), which receives a copy of the information stored at the location; if it needs to pass on a message it then creates and release the action potential. The signals message that sent will go down to the axon. 

The action potential reaches the synapses at the end of the axon and neurotransmitters are released. Neurotransmitters are the ways neurons pass on the message. 

The passes massage of the axons can be measured by electrical measures. To measure electrical charge, you need to use a pair of electrodes. Electrodes are electrical conductors that provide a path for electricity to enter or leave a medium.

Signals between neurons can be electrochemical in nature. An electrochemical signal that passes down the axon is called an action potential.

Before a potential occurs an inactive neurons contains positively charged potassium ions (k+) and large negatively charge protein molecules. Outside the neuron there are positively charge sodium (Na+) and negatively charged chloride ions (CI-). 

Here are some commons that occurs in action potential:

• Membrane potential, the electrical charge across a cell membrane; the difference in electrical potential inside and outside the cell.
• Oscilloscope, A laboratory instrument that is capable of displaying a graph of voltage as a function of time on the face of a cathode ray tube.
• Resting potential, The membrane potential of a neuron when it is not being by excitatory or inhibitory postsynaptic potentials; approximately -70 mV in the giant squid axon.
• Depolarization, Reduction (toward zero) --- see the table above----- of the membrane potential of a cell from its normal resting potential. 

All potentials have the strength (amplitude) so the intensity of action potentials is measured by the frequency the potentials are fired at (a strong impulse firing a volley of impulses) and the number of neurons stimulated.

Note: More information can be found at the text book of Carlson, N.R. (2010) in Physiology of Behaviour (10th edition)

Source photo taken from here.


  1. wah sekarang mostingnya lagi suka biologi ya jeng... hehehe

  2. lagi belajar mas buwel, hehehe

  3. hm... you should edit your posting, since there's no table showed while you requested to refer to the table :p

    hm.. such a nice refreshing of biochemistry :)

  4. tambah pengetahuan lagi deh.Thanks jeng...

  5. Owh... Ya udah siiip Jeng.... ditunggu lanjutannya Ea...

  6. kayaknya lebih cenderung belajar Kimia deh...

  7. That's so complicated for me..


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