Movement relies on the interactions of muscles and joints from "summary" of Physics of the Human Body by Richard P. McCall
The coordination of movement in the human body is a complex process that involves the interaction of muscles and joints. Muscles are tissues that contract and relax to produce movement, while joints are the connections between bones that allow for movement to occur. Together, muscles and joints work in harmony to enable the body to perform a wide range of activities, from walking and running to lifting and grasping. When a muscle contracts, it pulls on the bones to which it is attached, causing movement at the joint. For example, when the biceps muscle in the upper arm contracts, it pulls on the radius bone in the forearm, bending the elbow joint. Similarly, when the quadriceps muscle in the thigh contracts, it extends the knee joint, allowing the leg to straighten. In this way, the muscles and joints of the body work together to produce coordinated movement. The interactions of muscles and joints are governed by the principles of physics. One of the key principles at play is Newton's third law of motion, which states that for every action,...
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