The heart contracts independently ad spontaneously. Otherwise, you would have to consciously think about making it beat, and would probably die.
A muscle becomes shorter when it contracts.
When a muscle contracts, it shortens in length.
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
When a muscle contracts, it pulls with a force generated by the muscle fibers contracting and shortening.
Yes
When one muscle in a pair contracts the other expands.
skeletal muscle
shortens
Flexion
Flexion
The muscle that contracts when the leg is extended at the knee is call the gastrocnemius muscle
When the muscle contracts, the tendon pulls on the bone to create movement. The tendon is the connective tissue that attaches the muscle to the bone, so when the muscle contracts, it exerts force on the tendon, which in turn moves the bone.