Nematodes ultrastructure: complex systems and processes
网页2016年1月14日 · Most excretory systems appear to have secretory and osmoregulatory functions. Two basic types of S-E systems exist: glandular and tubular. Most free-living nematodes (Adenophora) have the glandular type while the tubular type is commonly found in the parasitic nematodes (Secernentae) (Nelson and Albert 1983). The most common arrangement is the ...
Nematode - Wikipedia
网页In many marine nematodes, one or two unicellular 'renette glands' excrete salt through a pore on the underside of the animal, close to the pharynx. In most other nematodes, these specialized cells have been replaced by an organ consisting of two parallel ducts connected by a single transverse duct.
Handbook - Excretory System - Wormatlas
网页2013年6月4日 · Four distinctive cell types make up the excretory system: one pore cell, one duct cell, one canal cell (excretory cell), and a fused pair of gland cells (ExcFIG 1A). The nuclei of all are located in the head region, on the ventral side of the terminal bulb of pharynx and pharyngeal-intestinal valve (ExcFIG 2A).
15.3 Flatworms, Nematodes, and Arthropods - OpenStax
网页2010年8月26日 · Physiological Processes of Nematodes. In nematodes, the excretory system is not specialized. Nitrogenous wastes are removed by diffusion. In marine nematodes, regulation of water and salt is achieved by specialized glands that remove unwanted ions while maintaining internal body fluid concentrations.
Nematodes - SpringerLink
网页2016年12月23日 · The excretory system of nematodes was named as such from morphological descriptions, but its function is rather osmoregulatory, ion regulatory, and even secretory rather than excretory. The tubular type of excretory system is the most common type among parasitic nematodes.
14.7: Phylum Nematoda - Biology LibreTexts
网页2022年7月31日 · Excretory System. In nematodes, specialized excretory systems are not well developed. Nitrogenous wastes may be lost by diffusion through the entire body or into the pseudocoelom (body cavity), where they are removed by specialized cells.
网页The body wall protects the nematode from the harsh external environment, serves as the exoskeleton and provides the mechanism for movement of the organism through the soil and plant tissue. The body wall also contains much of the nervous and secretory – excretory systems, and it plays a role in the exchange of gases. Outer body tube cuticle
Nematodes ultrastructure: complex systems and processes
网页2016年1月14日 · While nematodes have digestive, reproductive, nervous and excretory systems, they do not have discrete circulatory or respiratory systems. Nematodes use chemosensory and mechanosensory neurons embedded in the cuticle to orient and respond to a wide range of environmental stimuli.
Nematode Morphology and Classification | SpringerLink
网页2017年3月1日 · The excretory pore (Fig. 3.7) is the external opening of the excretory system. It is usually located ventrally in the region of the oesophageal isthmus, but it is sometimes far forward on the neck area (e.g. some Acrobeles spp.).
Functional Ultrastructure of the Excretory Gland Cell in Zoonotic ...
网页2019年11月17日 · The excretory system of the model nematode Caenorhabditis elegans orchestrates osmotic and ionic regulation and metabolic waste elimination analogous to the renal system of higher animals . Four specialized cell types form the system: a pore cell, a duct cell, a canal cell (or excretory cell), and a fused pair of gland cells.