500
Please name all three classes of levers, and give an example from the body of each explaining where the fulcrum,effort,and load is.
What is First Class Lever- Holding up the head, fulcrum is at the atlanto-occipital joint, Effort is the Posterior neck muscles, and load is the weight of the head or gravity pulling it forward. Second Class Lever-Standing on your tip toes, fulcrum is the interphalangeal joint, Effort is the calf muscle(Gastrocnemius),Load is the body weight going down towards toes. Third Class Lever-Flexion at the elbow, fulcrum is the elbow joint, effort is the biceps brachii muscle, and the load is the weight of the hand or whatever is in the palm.