A pulse is the rhythmic expansion of arteries as blood is pumped through them by the heart, commonly felt at the wrist (radial pulse) or neck (carotid pulse). Checking pulse is a basic vital sign assessment, indicating heart rate and rhythm. Normal adult resting pulse is typically 60-100 beats per minute. First responders, including municipal paramedics and firefighters, check pulses when assessing patients. Learning to find and count a pulse is basic first aid knowledge. Pulse oximeters, which clip onto fingers, can measure both pulse rate and blood oxygen levels. Abnormal pulse rates or rhythms may indicate various health conditions requiring medical attention.