GED Science Practice 2025 - Free GED Science Practice Questions and Study Guide

The rhythmic contraction and expansion of the arteries with each heartbeat is known as the pulse. The pulse is the result of the heart pumping blood into the arteries, causing them to expand and contract in response to the pressure wave generated by each heartbeat. This rhythmic activity can usually be felt at various points on the body, such as the wrist or neck, where arteries are close to the surface of the skin.

Respiration refers to the process of breathing and gas exchange, where oxygen is taken in and carbon dioxide is expelled. Metabolism encompasses all the biochemical reactions that occur in the body, including those that convert food into energy. Digestion involves the breakdown of food into its component nutrients so they can be absorbed by the body. While these processes are vital for overall health, they do not directly pertain to the concept of the rhythmic beating associated with the pulse.