Question

Amelia is running a marathon. How do her muscular and skeletal systems work together to allow her to run?. A. The muscles in her leg relax and contract to move the bones.. B. The muscles in her leg transport nutrients to the bones.. C. The bones in her leg relax and contract to move the muscles.. D. The bones in her leg transport nutrients to the muscles..

Answer 1

A. The muscles in her leg relax and contract to move the bones.

Step-by-step explanation:

There are different muscles in Amelia's legs that allow her to run the marathon. We can divide these muscles into two big groups extensors and flexors when the extensor muscles contract the flexor muscles relax allowing the extension of the leg. When the flexor muscles contract, the flexor muscles relax allowing the flexion of the leg. The muscles are attached to the bones, making them move when they contract or relax, we can say that muscles pull the bones up or down depending on the group of muscles that are contracting and relaxing.

Answer 2

The way that her muscular and skeletal systems work together to allow her to run is: A. the muscles in her leg relax and contract to move the bones
They work in pairs of flexors and extensors so they able to pull back the bones

hope this helps