Question

1. Muscles produce force

2. Muscles cross joints - creating distance between the line of force and axis of rotation
3. Body segments undergo angular motion
-->What is the cause of angular motion in the body?

Answer 1

Angular motion in the body is caused by muscles producing force and creating torque at joints. This leads to the rotation of body segments around joints, such as bending and straightening of limbs.

Step-by-step explanation:

Cause of Angular Motion in the Body

The cause of angular motion in the body is due to the action of muscles producing force across joints. When muscles contract, they create a force that acts on the bones they are connected to via tendons. Because muscles cross joints, they generate torque—a type of force that causes rotational, or angular, motion around a joint. Additionally, as joints move through different ranges of motion, the mechanical advantage and thus the force needed for movement can change. For example, as the biceps contract to flex the elbow, the angle between the forearm and upper arm decreases, resulting in flexion which is an angular movement.

Muscles work together in pairs, with one muscle responsible for bending a joint (flexion) and its counterpart for straightening it (extension). Movements such as lifting a limb or rotating a part of the body are examples of angular motions facilitated by muscular contractions.