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..
Health · High School · Tue Nov 03 2020
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A. The muscles in her leg relax and contract to move the bones.
The muscular and skeletal systems work together to allow running through a process called the musculoskeletal system. In this system, the muscles attach to the bones, often via tendons, which are a type of connective tissue. When Amelia runs, the muscles in her legs contract (shorten) and relax (lengthen) in a coordinated pattern that causes the bones to move. This muscle contraction pulls on the bones to which they are attached, creating movement at the joints. For example, when the muscles on the front of her thigh (the quadriceps) contract, they straighten her knee and push her leg forward. When the muscles on the back of her thigh (the hamstrings) contract, they bend her knee. This coordinated action allows her to propel herself forward as she runs.