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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.
Within the shark stomach, buoyancy is established from air taking up space and providing sharks the ability to float. The shark stomach also has shorter intestines than most animals, which causes food to take greater amounts of time to fully digest before being excreted from the body. [17]
The type of feed the animal consumes affects the amount of saliva that is produced. Though the rumen and reticulum have different names, they have very similar tissue layers and textures, making it difficult to visually separate them. They also perform similar tasks. Together, these chambers are called the reticulorumen.
Ruminants, in particular, have a complex four-chambered stomach. The first three chambers (rumen, reticulum, and omasum) are all lined with esophageal mucosa, [57] while the final chamber functions like a monogastric stomach, which is called the abomasum. In birds and crocodilians, the stomach is divided into two
Flesh is any aggregation of soft tissues of an organism.Various multicellular organisms have soft tissues that may be called "flesh". In mammals, including humans, flesh encompasses muscles, fats and other loose connective tissues, but sometimes excluding non-muscular organs (liver, lung, spleen, kidney) and typically discarded parts (hard tendon, brain tissue, intestines, etc.).
The skin is one of the largest organs of the body. In humans, it accounts for about 12 to 15 percent of total body weight and covers 1.5 to 2 m 2 of surface area. [1] 3D still showing human integumentary system. The skin (integument) is a composite organ, made up of at least two major layers of tissue: the epidermis and the dermis. [2]
The suckers allow the octopus to anchor itself or to manipulate objects. Each sucker is usually circular and bowl-like and has two distinct parts: an outer shallow cavity called an infundibulum and a central hollow cavity called an acetabulum, both of which are thick muscles covered in a protective chitinous cuticle. When a sucker attaches to a ...
The digestive gastrodermis in the Cnidaria or the gut epithelium in the bilaterally symmetrical animals may have developed from endoderm, whereas ectoderm is the precursor to the external skin layer , among other things. The interior space pervaded by a fiber syncytium in the Placozoa would then correspond to connective tissue in the other animals.