BIOL 1117 Lecture 19: Lecture 19 Notes

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Less output force is produced for a given amount of input force: ex. Atlanto-occipital joint lies between the muscles on the back of the neck and the weight of the face: unlike second or third class levers, mechanical advantages can vary in these levers from. The effort applied by the biceps muscle is applied to the forearm between the elbow joint and the weight of the hand and the forearm: flexing the forearm. Levers: the lever classification of a joint can change as it makes different actions, ex. Forearm: the forearm is a third class lever when it flexes at the elbow, the forearm is a first class lever when it extends out at the elbow, ex. Mandible: the mandible is a second class lever when we open the mouth, the mandible is a third class lever when we close the mouth to bite.

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