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The organs of Bojanus or Bojanus organs are excretory glands that serve the function of kidneys in some of the molluscs. In other words, these are metanephridia that are found in some molluscs, for example in the bivalves. Some other molluscs have another type of organ for excretion called Keber's organ.
The reniculate kidney is a multilobed kidney found in marine and aquatic mammals such as pinnipeds (seals, sea lions and walruses) and cetaceans (dolphins and whales) but absent in terrestrial mammals except bears. [1] Kidneys of this morphology have increased surface area for removing toxins from the body more efficiently than a non-lobed kidney.
The nephridium (pl.: nephridia) is an invertebrate organ, found in pairs and performing a function similar to the vertebrate kidneys (which originated from the chordate nephridia). Nephridia remove metabolic wastes from an animal's body.
This aquatic bivalve mollusc is somewhat oval in shape and may reach 10 cm (4 inches) in length. It is yellow to yellow-brown in color. It is yellow to yellow-brown in color. The shell is quite variable in appearance and may be confused with some species of Pleurobema .
A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails, clams, octopus, squid and relatives). Siphons in molluscs are tube-like structures in which water (or, more rarely, air) flows.
De-oxygenated haemolymph drains into a large venous sinus within the head and foot, which contains the nephridium, an excretory organ with a function similar to that of the vertebrate kidney. From here it passes into vessels within the gill, or into the capillary network of the pulmonate lung, before returning to the heart.
In mammals, the kidneys are usually bean-shaped [58] and located retroperitoneally [59] on the dorsal (posterior) wall of the body. [60] The outer layer of each kidney is made up of a fibrous sheath called the renal capsule. The peripheral layer of the kidney is called the cortex and the inner part is called the medulla. The medulla consists of ...
The tertiary lamellae are formed by folding the secondary lamellae in a fan-like shape. [21] Water moves slowly in one direction over the gills and lamellae, into the mantle cavity and out of the octopus' funnel. [22] The structure of the octopus' gills allows for a high amount of oxygen uptake; up to 65% in water at 20 °C (68 °F). [22]