Question

What are electrical impulses ? How they are produced?

Answer 1

The human brain has approximately 100 billion nerve cells. Nerve cells are also found in the spinal cord. Together, the brain and spinal cord make up the central nervous system (CNS). Each nerve cell is called a neuron, and this is comprised of a cell body directing its activities; dendrites, small, branchlike extensions that receive signals from other neurons to transmit to the cell body; and the axon, a long extension from the cell body along which electrical signals travel. Such signals not only connect the brain and spinal cord, but they also carry impulses to muscles and glands. The electrical signal that travels down an axon is called a nerve impulse.

The electricity produced by our bodies is what allows synapses, signals and even heartbeats to occur. See more heart pictures.
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Without electricity, you wouldn't be reading this article right now. And it's not because your computer wouldn't work. It's because your brain wouldn't work.
Everything we do is controlled and enabled by electrical signals running through our bodies. As we learned in intro physics, everything is made up of atoms, and atoms are made up of protons, neutrons and electrons. Protons have a positive charge, neutrons have a neutral charge, and electrons have a negative charge. When these charges are out of balance, an atom becomes either positively or negatively charged. The switch between one type of charge and the other allows electrons to flow from one atom to another. This flow of electrons, or a negative charge, is what we call electricity. Since our bodies are huge masses of atoms, we can generate electricity