When a muscle contracts, it moves a bone by engaging:

he muscles span the joint and connect the bones. When the muscles contract, they pull on the bones, causing them to move

Explanation:

Muscles are attached to bones by strong tendons . When a muscle contracts, it pulls on the bone, and the bone can move if it is part of a joint

The Student Union is holding its weekly Friday night "De-stress ’til Dawn" mixer. Brandon is hungry, Shelby is tired, and Tina feels cold. Which brain structure controls the internal biological clocks responsible for regulating these processes?

The hypothalamus is the part of the brain that controls all these related emotions, temperature (be it cold or hot), sleep among others. It is a small part of the brain that does this tagged as hypothalamus

Explanation: