Take the D scale for example. Start on the D note at the second fret and move up the scale like this to the next D: If you play this same pattern up two frets (so the E is the first note you play), youâll have an E major scale. The same goes for any other pattern you can spot in these scale maps.
A pacemaker signals the heart to beat when the heartbeat is too slow or irregular. A pulse generator is a small metal case that contains electronic circuitry with a small computer and a battery that regulate the impulses sent to the heart.
It only works when it's needed. A typical pacemaker simply can keep the heart from going too slowly but if a person had their heart stop the pacemaker usually won't work, says Dr. Chazal. About the size of a pocket watch, the pacemaker is smaller and targets arrhythmias.