ECG

Resting membrane potential of a cell is Negative -70 mV.  Membrane potential is the difference between interior charged and exterior charged of a cell, at rest, it is -70 mV. So, inside of cell is negative charged. Sodium and potassium both are positive charged. During depolarization in order to function as contraction of cell, positive charged sodium enter into cell and cell become more positive inside until a level is called depolarization then it starts to be lost positivity through potassium out of the cell is called repolarization until reached -70 mV and if, further repolarization occurs is called hyper polarization. Cycle repeated in order to function of cell. This depolarization and repolarization work as electrical impulse is recorded on ECG Strip show it as waves named P, QRS, T and U as a result contraction and relaxation of muscle cells, specially cardiac muscles. Cardiac cells are specialized due to presence of SA node, AV node, and purkinje fibers have extra power to contract the cell, that is why short event than other cells to be contracted or to be function.

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Article:Calculate thePulse

   put tips of your two fingers index and middle together into wrist then count  the numbers of beats  or hits on tips of your fingers for 15 second then multiply  it by 4 ; the result is your pulse rate per minute. Example:

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