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Digestive system/stomachs. Henricia sanguinolenta has two stomachs, a small intestine, and a rectum leading to an anus. The two stomachs are called the cardiac stomach, and the pyloric stomach. The cardiac stomach is on the oral side, in the center of the disc. It is covered by a thin membrane and sphincter. When the sea star has its prey, it ...
All organs connect to the digestive system in the central disk, which also contains the starfish mouth and stomach. [5] This replication and delocalization of vital organs makes starfish especially resilient to the loss of appendages. In addition to being able to replicate organs, starfish are also capable of regenerating neuron cells.
Echinoderms possess a simple digestive system which varies according to the animal's diet. Starfish are mostly carnivorous and have a mouth, oesophagus, two-part stomach, intestine and rectum, with the anus located in the centre of the aboral body surface. With a few exceptions, the members of the order Paxillosida do not possess an anus.
The water vascular system of the starfish is a hydraulic system made up of a network of fluid-filled canals and is concerned with locomotion, adhesion, food manipulation and gas exchange. Water enters the system through the madreporite, a porous, often conspicuous, sieve-like ossicle on the aboral surface. It is linked through a stone canal ...
Typically ten bursae are found, and each fits between two stomach digestive pouches. Water flows through the bursae by means of cilia or muscular contraction. Oxygen is transported through the body by the hemal system, a series of sinuses and vessels distinct from the water vascular system. [5]
For decades, scientists theorized a starfish didn’t have heads. A new study finds that they might, in fact, only have heads.
The madreporite is a small calcified pore that is the location for drawing in and expelling water to fill the water vascular system. [10] The digestive tract contains two stomachs, a large cardiac portion and a smaller pyloric portion. [7] Each digestive gland in the body of Echinaster is connected to the pyloric stomach by the Tiedmann's pouch ...
The stomach surface secretes digestive enzymes that allow the starfish to absorb nutrients from the liquefied coral tissue. This leaves a white scar of coral skeleton that is rapidly infested with filamentous algae. [24] An individual starfish can consume up to 6 square metres (65 sq ft) of living coral reef per year. [25]