Peristalsis is the name for this phenomenon.
peristalsis
Peristalsis It is the involuntary wavelike movement that occurs in almost all the tubular structures in the body. It is especially seen in GIT (Gastrointestinal tract) Fallopian tubes, etc. In GIT this movement is responsible for the propulsion of the food further into the tract and its proper digestion. In fallopian tubes this movement helps to carry the ovum towards uterus. This movement is controlled by autonomic nervous system.
Smooth muscle (involuntary)lines ducts and vessels.
The answer is Microtubule.
They are called centrioles, and are only found in animal cells.
A prism that is hollow.
That tree is hollow. Do you have a hollow leg? I'm going to hollow out a hole.
Peristalsis is the rhythmic movement of the hollow digestive tract.
No it does not, you are describing a member of the echinoderm family.
hollow
hollow
no its not hollow