- Chinese name
- Excretory organ
- Foreign name
- Excretory organ
- Role
- The products produced by the metabolic process are discharged from the body
- Example 1
- Retractile vesicle of protozoa
- Example 2
- Malpighian tubules of insects
- Human body
- Kidney, lung, skin, liver
organ
Excretion organ of planarian Mesonephros It is the excretory function of fish and amphibians in the adult stage organ , on Pronephrine Behind. Excretory canalicular Nephrostome The renal orifice of some tubules is even completely degenerated, which cannot be directly connected with Coelom be interlinked. near Nephrostome Nearby excretion tubule The end of the small branch expands and collapses into a double-layer cystic structure, called the kidney Balloon (Baumann's bursa), which encloses the vascular bulb and forms the renal corpuscle together（ malpighian body ）。 Renal corpuscle and its excretion tubule It forms a basic structure of urinary function, especially called nephron（ nephron ）。 stay Mesonephros Stage Pronephrine The duct is divided into two longitudinal sections, one of which is collected and excreted tubule The main conduit of urine, namely mesonephric duct, has the function of vas deferens in male animals; The other tube has degenerated in the male and evolved into a fallopian tube in the female. 
Metanephric Metanephric yes Reptiles Excretion of adult birds and mammals organ , located close to Coelom After. The external morphology varies with different animal species. Metanephric excretion tubule Only renal corpuscles are at the end, Nephrostome Has completely disappeared. The main pipeline that the renal tubules transport urine into is the posterior renal duct（ Pronephrine Conduit, Mesonephros Catheters and posterior renal catheters, also commonly referred to as ureters). This pipe is made by Mesonephros A pair of projections from a duct that extend forward to form a duct, one for each Metanephric connect. After metanephrosis, Mesonephros And mesonephric duct have lost the function of urination and become reproductive system The mesonephric duct becomes the vas deferens completely, and the remaining mesonephric duct excretes tubule It forms epididymis and other structures. Posterior kidney is vertebrate The most advanced type of kidney. In the case of mammals, its Metanephric It is a pair of main excretions that are usually bean shaped organ The urine is filtered out and discharged through the ureter, bladder and urethra. Excretory action Means Biology The role of the body in expelling metabolic wastes from the body is that all Biology The necessary process for survival. Unicellular organism pass through Cells Waste is discharged from the surface. Advanced plants stoma exhaust 。 multicellular organism There is special excretion organ 。 Some of them are involved in excretion organ (Others system And can also be classified into excretory system （ Excretory system ）Part of. （1） No special excretor as coelenterate Etc., by each Cells Direct gas exchange and waste discharge; Echinodermata collect metabolites from the deformed cells in the coelomic fluid and escape from the body through the skin gills. (II) Contractile vesicle . Found in freshwater protozoa and Porous animal . (III) Primary kidney Type. See Flatfish , animals with pseudocoelom and Annelida and Molluscs Larvae. The basic structure is a pair of vertical excretory tubes and an unequal number of Flame cell , the flame cell is hollow, and there is a bunch of cilia The collected waste is sent to the excretory pipe and discharged through the excretory hole. However, nematodes only have one tubular or H-shaped cell derived from the protonephric cell, and there is no cilia in the cell. The excretory pipe is an intracellular pipe (IV) Metanephric Type, found in annelids and Molluscs . The basic structure includes opening at Coelom 1 or more pairs of glands organ Metabolic waste is discharged from the renal pore Metanephric duct （ Ectoderm Source) and Mesoderm The source of coelomic duct is a common conduit and drainage hole. Some types can also be Protonephric duct Some crustaceans have excretory apparatus similar to metanephric duct Antennal gland . 
invertebrate
invertebrate GOOGLE
Inverterates to rid the body of waste organs The general sub-situations: (1) no special drainage devices. Such as coelenterate, etc. directly from the various cells, gas exchange and discharge of waste; echinoderms from the deformation of body cavity fluid cell collection metabolites across the skin gills escape in vitro. (2) contraction bubble. protozoa found in fresh water and porous animal production. (3) of the original kidney. found in Platyhelminthes, there are fake body cavity of animals and part of animals and molluscs larvae. the basic structure for the 1 on the longitudinal excretory duct and the number of lines, ranging from flame cell flame cell hollow, containing a bundle of cilia continue to swing to the collection of waste sent to the excretory duct, excretory pore from the exhaust. But the line of insects is only one original cell-derived renal tubular or H-shaped cells, nonciliated cells, excretory duct cells of pipes for. (4) after the kidney-type. found in annelid and molluscs. the basic structure, including openings in the body cavity of the 1 on one or more pairs of glandular organs, metabolic wastes discharged by the kidneys Kong. annelid post-renal tube (ectodermal origin) and the mesoderm may be the source of the body cavity tube synthesis of the common ducts and excretory pore. Some species can also be the original kidney tube and body cavity catheter synthesis. some crustacean similar excretion of renal tube device, saying antennary gland. (5) Malpighian tubules. found in terrestrial arthropods. Malpighian tubules was filamentous, from two to hundreds of Article immersed in the blood. Malpighian tubules of the wall is only one layer of cells, the end of the blind side, other side of the pass into the gastro-intestinal, metabolic wastes excreted by the anus.
