In the body, lever systems involve the interaction of __1__, which provide the force, and __2__, which provide the lever arms. The force is exerted where __3__. The site at which movement occurs in each case is the intervening __4__, which acts as a fulcrum.

Question

1. muscles?
2. speed?
3. ?
4. joints?

Answer 1

1. skeletal system
2. force
3.

Answer 2

1. muscles
2. speed
3. inserts
4. joints

Answer 3

1 Skeletal Muscles
2 Bones
3 Muscle inserts
4 Joint

Answer 4

h