Table of Contents
What is the difference between the cardiac stomach and the pyloric stomach of the sea Star?
In starfishes the cardiac stomach is connected to a pyloric stomach which is located above it. Food can be brought into the stomach through the mouth or, in many species, the cardiac stomach can be extended out through the mouth to digest food outside the body.
What does the cardiac stomach do in a starfish?
The cardiac stomach in the starfish is found at the center of the body. It is used to envelop the prey, break it down.
What does the pyloric CECA do in starfish?
With the stomach inside, the starfish digests the mollusk in the shell. The pyloric stomach is connected by two pyloric caeca- hollow tubes that absorbs nutrients from its food.
Can the pyloric stomach exit the starfish?
From there, the nutrients travel down the pyloric ducts to the pyloric ceca at the end of each arm where nutrients are absorbed and stored. Waste travels from the pyloric stomach through a short intestine and is excreted through the anus located at the top of the starfish.
What is cardiac stomach?
(KAR-dee-uh) The part of the stomach that is closest to the esophagus. Food and liquids pass through the cardia to enter the stomach from the esophagus. A valve near the cardia helps keep stomach contents from backing up into the esophagus.
Why is it called cardiac stomach?
The right margin of the oesophagus is continuous with the lesser curvature of the stomach, while the left margin joins the greater curvature at an acute angle, termed the cardiac notch (or cardial notch).
What is the function of cardiac stomach?
The part of the stomach that is closest to the esophagus. Food and liquids pass through the cardia to enter the stomach from the esophagus. A valve near the cardia helps keep stomach contents from backing up into the esophagus.
What is the function of the pedicellariae in a sea star?
Pedicellariae attach and articulate to small granules on the surface of the test. In life the pedicellariae are in constant motion. The valves that form the head can open and close and the primary function of the pedicellariae is to keep the surface of the test free of debris and small parasites.
What does a cardiac stomach do?
What do cardiac and pyloric glands secrete?
Both the cardiac and pyloric glands secrete mucus, which coats the stomach and protects it from self-digestion by helping to dilute acids and enzymes.
What is cardia and gastric fundus?
Food and liquids pass through the cardia to enter the stomach from the esophagus. A valve near the cardia helps keep stomach contents from backing up into the esophagus. Enlarge. The stomach is an organ in the upper abdomen. It is divided into 5 sections: the cardia, the fundus, the body, the antrum, and the pylorus.
What is meant by pyloric stomach?
(py-LOR-us) The part of the stomach that connects to the duodenum (first part of the small intestine). The pylorus is a valve that opens and closes during digestion. This allows partly digested food and other stomach contents to pass from the stomach to the small intestine. Enlarge.
Where is the cardia and fundus?
stomach
The cardia (or cardiac region) is the point where the esophagus connects to the stomach and through which food passes into the stomach. Located inferior to the diaphragm, above and to the left of the cardia, is the dome-shaped fundus. Below the fundus is the body, the main part of the stomach.
What is fundus stomach?
The fundus is a rounded section next to the cardia. It’s below your diaphragm (the dome-shaped muscle that helps you breathe). The body (corpus) is the largest section of your stomach. In the body, your stomach contracts and begins to mix food.
What is a Fundic?
(FUN-dus) The part of a hollow organ that is across from, or farthest away from, the organ’s opening. Depending on the organ, the fundus may be at the top or bottom of the organ. For example, the fundus of the uterus is the top part of the uterus that is across from the cervix (the opening of the uterus).
What are pedicellariae used for in echinoderms?
Pedicellaria are small, snapper-like skeletal elements that are used by the echinoderm to keep small organisms from settling on its body. Echinoderms also have a spacious coelom (an open, fluid-filled body cavity lined with tissue), large gonads, and (usually) a complete gut.
What are pedicellariae made of?
Types. Four main forms of pedicellariae are found in sea urchins : tridactylous, ophicephalous, triphyllous and globiferous. There are typically three valves that make up the jaw of sea urchin pedicellaria. The stalk is composed of a skeletal rod and a flexible neck portion.
What do Fundic glands secrete?
The fundic glands (or oxyntic glands), are found in the fundus and body of the stomach. They are simple almost straight tubes, two or more of which open into a single duct. Oxyntic means acid-secreting and they secrete hydrochloric acid (HCl) and intrinsic factor.