Biomechanics Quiz

A fulcrum is specifically defined as the point about which the lever pivots, enabling the lever to lift or move objects.

A moment arm refers to the perpendicular distance from the axis of rotation to the line of action of the force.

An agonist is a muscle that causes shortening and contraction during movement, while antagonist is the muscle that causes lengthening and extension. The brain controls movement, but it is not specifically referred to as an agonist. Bones provide structure and support, but they are not muscles involved in movement.

In muscular movement, the antagonist muscle relaxes to allow the agonist muscle to contract and produce the desired movement. This coordinated effort between agonist and antagonist muscles is crucial for smooth and controlled movements.

Synergist muscles work together with the agonist muscles to produce a coordinated movement. They assist the agonist in generating the desired movement.

In muscle movement, stabilizers help support and assist the agonist muscle in performing the desired movement.

In a First Class Lever, the fulcrum is located between the effort (muscular force) and the load (resistance force), allowing for mechanical advantage.

Second Class Levers are less common than First and Third Class Levers, but they have unique characteristics in terms of the positioning of the muscular force and resistance force in relation to the fulcrum.

In a Third Class Lever, the muscular force and resistance force both act on the same side of the fulcrum, with the muscular force closer to the fulcrum than the resistance force.

The Contractile Component is composed of both actin and myosin filaments, which work together during muscle contraction. Actin and myosin filaments interact to generate the force exerted by muscles.

The Series Elastic Component is related to muscle mechanics and energy storage during muscle contractions.

The pennation angle refers to the angle between the muscle fibers and an imaginary line extending from the muscle's origin to its insertion. It is not related to muscle strength, muscle contraction type, or muscle fatigue rate.

The Parallel Elastic Component refers to the passive muscle structures like the epomysium, perimysium, etc. that exert force when a muscle is stretched. It is not related to active muscle structures for movement, tendons, or bursa sacs.