Explain how the structure and function of one of the muscles of the chest relates to some of the muscle rules you learned in Activity 4.2.1.

The muscular system

Explanation:

The muscular system is a set of muscles that can be controlled voluntarily by a living organism (skeletal muscles) Its main function is to achieve mobility, an action that takes place when electrical stimuli from the nervous system cause the contraction of muscle fibers . Muscles that contract automatically such as heart muscle or smooth muscles are not usually considered part of the muscular system. The whole skeletal musculature corresponds to approximately 40% of the weight of an adult man. The sum of the muscular system plus the bone system formed by the bones gives rise to the musculoskeletal system.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: