![]() Those crucial signals that tell our hearts to speed up when we're in danger come from a mass of cells in our heart called the sinoatrial node, or SA node. ![]() If our bodies relied entirely on, say, the movement of chemicals to tell our hearts to speed up when something is chasing us, we probably would've died out a long time ago. They allow for a nearly instantaneous response to control messages. It's sort of like the digital cable signal carrying 1s and 0s that deliver "Law & Order." Except in our bodies, electrons aren't flowing along a wire instead, an electrical charge is jumping from one cell to the next until it reaches its destination.Įlectricity is a key to survival. ![]() When we talk about the nervous system sending "signals" to the brain, or synapses "firing," or the brain telling our hands to contract around a door handle, what we're talking about is electricity carrying messages between point A and point B.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |