we live in the Human Show under an iron dome, or maybe in a yellow submarine but up is down and down is up and the only way out is the hull like in Poseidon Adventure
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Does the human heart produce electricity?
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Michael McClennen
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Scientist and science enthusiastUpvoted by
Michael Soso
, BA Berkeley Physiology/Biophysics 1967, PhD Neurophysiology UW 1975 and MD Stanford 1979, 30 years on U Pitt …6y
Originally Answered: Where does the electricity come from, that the brain and the nervous system use? Does the heart produce electricity?
The electrical potentials produced by the brain and nervous system are produced all along the length of every nerve cell. This is a completely different phenomenon from the kinds of electrical potentials we use in our computers and other electronic devices.
In human-constructed devices, electrical potentials are generated by a battery or else at a central power generating station, and these potentials are conducted to the device and throughout its circuitry by metal wires. The wires themselves are passive conductors, without any generation capability of their own (although devices called capacitors are used throughout electronic circuits, and they have the ability to store electrical potential and then use it at a later time to drive the circuits to which they are connected.) The potentials in the wires of an electronic device are oriented from one end to the other. That is, one end of every wire is at a positive potential relative to the ground, and the other end is at a negative potential.
In living things, by contrast, every neuron generates an electrical potential all along its cell body and along its axons and dendrites. These potentials are oriented not end-to-end, but rather inside-to-outside. A neuron at rest keeps an electric potential of about -70 millivolts between its inside and its outside. It does this by actively pumping positively charged sodium ions or calcium ions out of the cell, so that its interior has a slight negative charge. When a neuron fires, special “voltage gated ion channels” open up, letting the sodium or calcium ions flood back into the cell. This causes the electrical potential across that section of membrane to switch to the other direction, and that voltage change triggers nearby ion channels to open up, causing the potential across an adjacent section of cell membrane to switch as well. This sets off a wave of potential reversal, called “depolarization”, which sweeps along the neuron to its other end. Then, the ion pumps on the neuron’s membrane kick in and pump the ions back out, to get the cell ready to fire again.
As you can see, neurons are not passive wires, conducting electricity generated somewhere else. Rather, every neuron generates its own electrical potential through the action of its membrane pumps, and uses up a little bit of food to provide the necessary energy every time it does so. That is why you can’t think very well when your blood sugar level falls. When this happens, the neurons in your brain can’t absorb enough food, and so cannot fire as often as they need to.
430pm et
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the danni?