Its a canal :)
the stone canal connects the madreporite to the ring canal and the ring canal allows water to flow into the radial canals, just tubes...
The anal canal has a ring of muscle, called the anal sphincter
An abdominal ring is either of the two openings in the abdominal muscle wall allowing the inguinal canal to pass through.
Holds all limbs together
that's easy it goes through the sieve plate, to the stone canal, then into the ring canal , to the radial canal and out the tube feet which are also used for respiration :)
There are hundreds of canals in Amsterdam, but I am going to assume that you're inquiring about what is referred to as the "canal ring" or grachtengordel" which is comprised of 4 nearly concentric canals that ring the city center (oldest part of Amsterdam). The inner most/first canal is known as the Singel. It is followed by the Herengracht (Gentleman's Canal), the Kaisergracht (The Kaiser's Canal), and the Prinsengracht (The Prince's Canal). The Brouwersgracht (The Brewer's Canal) is also one of the more historic canals in Amsterdam, as well.
"Prinsengracht" is a Dutch term that translates to "Prince's Canal" in English. It refers to one of the main canals in Amsterdam, Netherlands, which forms part of the iconic Canal Ring district.
These tumors develop in the transitional zone, or cloaca, which is a ring of tissue between the anal canal and the rectum.
It depends what you're comparing them to. Here's a list some of the parts of a starfish: radial canal ring canal stone canal stomach reproductive glands digestive glands water vasculatory system optic cushion tube feet madreporite
It is the part that extends from the ring canal, all the way to the tip of the starfish. It's under the gonad.
The top three spots for vacationing in Amsterdam include the Amsterdam canal ring, Het Scheepvaart Museum, and Rijksmuseum. The canal ring is peaceful for a walk or for a boat ride. The Rijksmuseum is the largest museum in the Netherlands and both museums are worth a visit when visiting Amsterdam.