The t tubule contributes to muscle movement because it .

Explanation:

The t tubule contributes to muscle movement because it gives a signal to the sarcoplasmic reticulum to release the calcium that activates muscle contraction.

Explanation:

The T Tubules are tubular infoldings of the sarcolemma (the plasma membrane of the muscle fiber) that penetrate through one cell and emerge on its other side. Each of these T tubules is associated with two terminal cisternae, constituting a triad.

When the stimulus for muscle contraction arrives, the T tubule sends the signal to the sarcoplasmic reticulum, which is a big calcium deposit, to release the calcium and the start the muscle contraction process.

i'd say that the moon rock is about 2.2 billion years old.