Pulse: Tactile arterial palpation of the heartbeat by trained fingertips

You can feel someone's pulse in their wrist, thumb or neck, where vessels are closer to the skin. A normal pulse is below 100 beats per minute. Our pulse quickens when we exercise because the muscles being used need more oxygen. Unusually fast or slow or irregular pulse might mean sickness.

There are normally four heart sounds. Two of them, S1 and S2, can be heard with a stethoscope. Two other sounds, S3 and S4, can not be heard, but they can be seen using a machine called a phonocardiograph.

Pulses is a term for peas, beans and lentils.

This short article about biology can be made longer. You can help Wikipedia by adding to it.