Linear density. Linear density is the measure of a quantity of any characteristic value per unit of length. Linear mass density (titer in textile engineering, the amount of mass per unit length) and linear charge density (the amount of electric charge per unit length) are two common examples used in science and engineering.
Gastrovascular system of the flatworm Dugesia, colored yellow. The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals.In cnidarians, the gastrovascular system is also known as the coelenteron, and is commonly known as a blind gut or blind sac, since food enters and waste exits through the same orifice.astrovascular system of the flatworm Dugesia, colored yellow. The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals.
With this type of digestive system there is a single opening, the mouth, in which food will enter and digestive waste will be eliminated. The gastrovascular cavity not only serves as the site of digestion but also is important in support (as it is filled with water), gas exchange, and the excretion of metabolic wastes.ith this type of digestive system there is a single opening, the mouth, in which food will enter and digestive waste will be eliminated. The gastrovascular cavity not only serves as the site of digestion but also is important in support (as it is filled with water), gas exchange, and the excretion of metabolic wastes.