nephridia in arthopods?

[pistolpete007]

this is according to wiki:
Nephridia are invertebrate organs which function similarly to kidneys. They remove metabolic wastes from an animal's body. They are present in many different invertebrate lines. There are two basic types, metanephridia and protonephridia.

[edit] Metanephridia

A metanephridium (pl. metanephridia) is a type of excretory gland or nephridium found in many types of invertebrates such as annelids, arthropods and molluscs. It typically consists of a ciliated funnel opening into the body cavity or coelom connected to a duct which may be variously glandularized, folded or expanded (vesiculate) and which typically opens to the organism's exterior. These ciliated tubules pump water carrying surplus ions, metabolic waste, toxins from food, and useless hormones out of the organism through openings known as nephrostomes. This waste is passed out of the body at the nephridiopore. The primary urine produced by filtration of blood (or a similar functioning component) are modified into secondary urine through selective reabsorption by the cells lining the metanephridium.
In many earthworms the nephridial ducts open into the digestive tract instead, a condition known as enteronephry.
Nephridia are invertebrate organs which function similarly to kidneys. They remove metabolic wastes from an animal's body. They are present in many different invertebrate lines. There are two basic types, metanephridia and protonephridia.



so according to this arthropods have metanephridia which is a type of nephridia....however in topscore test 2 question 23
"Excretion can be best describe as "
a. pair of nephrida excreting nit. waste
b. nit waste excreted in form of uric acid crystal
c. uric acid accumulating in the malaphigian tubles
d.co2diffuse from blood and cont. exhalled
e. B and C

shouldnt the answer be a b and c?

also what else forms uric acid crystals?

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[osimsDDS]

this is according to wiki:
Nephridia are invertebrate organs which function similarly to kidneys. They remove metabolic wastes from an animal's body. They are present in many different invertebrate lines. There are two basic types, metanephridia and protonephridia.

[edit] Metanephridia

A metanephridium (pl. metanephridia) is a type of excretory gland or nephridium found in many types of invertebrates such as annelids, arthropods and molluscs. It typically consists of a ciliated funnel opening into the body cavity or coelom connected to a duct which may be variously glandularized, folded or expanded (vesiculate) and which typically opens to the organism's exterior. These ciliated tubules pump water carrying surplus ions, metabolic waste, toxins from food, and useless hormones out of the organism through openings known as nephrostomes. This waste is passed out of the body at the nephridiopore. The primary urine produced by filtration of blood (or a similar functioning component) are modified into secondary urine through selective reabsorption by the cells lining the metanephridium.
In many earthworms the nephridial ducts open into the digestive tract instead, a condition known as enteronephry.
Nephridia are invertebrate organs which function similarly to kidneys. They remove metabolic wastes from an animal's body. They are present in many different invertebrate lines. There are two basic types, metanephridia and protonephridia.



so according to this arthropods have metanephridia which is a type of nephridia....however in topscore test 2 question 23
"Excretion can be best describe as "
a. pair of nephrida excreting nit. waste
b. nit waste excreted in form of uric acid crystal
c. uric acid accumulating in the malaphigian tubles
d.co2diffuse from blood and cont. exhalled
e. B and C

shouldnt the answer be a b and c?

also what else forms uric acid crystals?

I believe the key word here is EXCRETION therefore the process of excretion occurs in anthropods by excreting uric acid crystals.....the process of digestion is prob the accumumlation of uric acid in the malphegian tubules...

 

[Simiam]

I don't think A works in the context of the question...

Arthropods form uric acid crystals. I guess basically anything that lives in an environment which forces it to conserve as much water as possible. IE snakes form crystals.. rats.. etc.

 

[Dencology]

Excretion in Arthropods is in the form of uric acid crystals which forms in Malpigian tubules. Annelids has nephridia ( like kidny, waste forms here) and they excret their waste through their skin (CO2).