Levers definitions Flashcards
Levers definitions
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Lever A rigid rod in the body, typically a bone, used to move a load with applied force. Fulcrum The pivot point of a lever, often a joint in the human body. Effort The force applied to a lever, usually at the muscle insertion point. Load The weight or resistance that is moved by a lever. First Class Lever A lever with the fulcrum between the effort and the load, like the head's movement. Second Class Lever A lever with the load between the effort and the fulcrum, providing mechanical advantage. Third Class Lever A lever with the effort between the fulcrum and the load, allowing greater speed and range. Mechanical Advantage A condition where less effort is needed to move a load due to lever structure. Mechanical Disadvantage A condition requiring more effort to move a load, but allows greater speed and range. Splenius Capitis A muscle that helps move the head using a first class lever system. Biceps Brachii A muscle in the arm that operates as a third class lever, requiring more effort. Calf Muscle A muscle that acts as a second class lever, providing mechanical advantage. Range of Motion The extent of movement possible in a joint or lever system. Pivot Point Another term for fulcrum, the point around which a lever rotates. Insertion The point where a muscle attaches to a bone, applying force in a lever system.
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