Tubules
Trachaea
Spiracles
Lungs
Gills
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The respiratory organ of the crab is the **gills**. However, it's important to note that some crabs, especially those that live on land, have adaptations that allow them to breathe air. These crabs use a lung-like branchial chamber that houses the gills. This adaptation allows them to survive both underwater and on land. So, while gills are the primary respiratory organ, some crabs also have structures that function similarly to lungs. Therefore, the answer could be considered **E. Gills** or **D. Lungs** depending on the specific type of crab in question.
But from what I've gathered, crustaceans generally make use of gills because they Re aquatic. However, Crabs make use of branchiostegal lungs. It's an adaptation of air-breathing athropods like crabs and hermit
Branchiostegal lungs are a specialized adaptation found in certain terrestrial or semi-terrestrial crabs that allows them to breathe air. While most crabs rely on gills (which work best underwater), land-dwelling crabs have evolved modifications of their gill chambers—often called branchiostegal lungs—to extract oxygen from the air. These structures function somewhat like a lung:
1. Location and structure: Branchiostegal lungs are housed in expanded branchial (gill) chambers. Their lining is vascularized (rich in blood vessels), which helps absorb oxygen from air instead of water.
2. Why the adaptation? Land crabs spend much of their lives on land, so standard gills (which must remain moist to work) are less efficient outside water. By having these lung-like structures, terrestrial crabs can still perform gas exchange even in drier environments.
3. Not all crabs have them: Marine crabs still rely on traditional gills, whereas only certain species of crabs that spend considerable time out of water (e.g., coconut crabs, some land crabs) possess fully or partially developed branchiostegal lungs.
So, while gills are the main respiratory organ across most crab species, branchiostegal lungs are an important evolutionary adaptation in crabs that live on land or transition frequently between land and water.
A branchiostegal lung is a respiration organ used by some air-breathing arthropods. It is one of the most significant adaptations of some crabs and hermit crabs such as the coconut crab to their terrestrial habitats
It sounds like there might be a mistake in the options or the answer key. Crabs do not have lungs; they have gills as their respiratory organs. Lungs are not found in crustaceans like crabs, which are primarily aquatic organisms and rely on gills for breathing underwater. Therefore, the correct answer should be option (e) gills, not option (d) lungs.
that was chatgpt, now me
the so called branchio whatever lungs are specialized gills, so therefore gills are their respiratory organs.
A crustacean carrues out gaseous exchange through gills
so the answer is gills and not lungs.
MODERN BIOLOGY PAGE 26
the answer should be gills
lungs shouldn't be the correct answer. lungs are used by mammal
some crab like the coconut crab make use of branchiostegal lungs
the answer should be gills
lungs shouldn't be the correct answer. lungs are used by mammal
some crab like the coconut crab make use of branchiostegal lungs .
the option said lungs not branchiostegal lungs
thanks
the correct answer is Gill
because most crabs which are aquatic use gills which terrestial crab use branchiostegal lungs
