Our muscles can act with our bones to form lever systems. The lever system that allows a bicep curl would be considered a and the lever system that allows you to lift your head from your chest would be considered a . A 1st class lever; 2nd class lever B 2nd class lever; 1st class lever C 1st class lever; 3rd class lever D 3rd class lever; 1st class lever

D 3rd class lever; 1st class lever

Explanation:

The biceps attaches between the fulcrum (the elbow joint) and the load, this means that the bicep curl uses a third-class lever.

The first-class lever is where the fulcrum is in the middle of the effort and the load. These types of levers are found in the neck when raising your head to head a football. The neck muscles provide the effort, the neck is the fulcrum, and the weight of the head is the load.

the answer is c   it wants me to write more for no reason bu c is the answer                                                                                                                

answer; philip zimbardo;