It undergoes phase change and becomes a liquid.
When the Deltoid contracts the humerus abducts.
When the bicep contracts the triceps relax
When a muscle contracts, it shortens in length.
When a spinning mass of gas contracts, its speed of rotation will increase due to the conservation of angular momentum. This is similar to how a figure skater spins faster when they pull in their arms. As the gas cloud contracts, it spins faster to maintain its momentum.
right
It contracts.
It contracts
Points The toes
It contracts. solid
A nebula.
relax
It increases.