what is monopectinate gill
Answers
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Explanation:-
A ctenidium is a respiratory organ or gill which is found in many mollusks. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snail and marine snails. Some aquatic gastropods possess one ctenidium known as monopectinate and others have a pair of ctenidia known as bipectinate.
A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. It hangs into the mantle cavity and increases the area available for gas exchange. The word is Latinized but is derived from the Greek ktenidion which means "little comb", being a diminutive of the word kteis meaning comb.
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Ctenidium — as the Respiratory Organ:
Explanation:
- Sea-going molluscs breathe through ctenidia. These are the brush like outgrowths of the mantle and are situated inside the mantle pit.
- Structure: Every ctenidium (pl. ctenidia) or molluscan gill comprises of a since quite a while ago straightened pivot dangles from the front mass of the mantle depression. The ctenidium contains different veins, muscles and nerves. A column of leveled, triangular gill fibers or lamellae is appended to each side of the conidial pivot. The outside of ctenidium is commonly secured with cilia.
- An instrument of Aquatic Respiration: The development of water is affected through the mantle pit by the beating of cilia. Every ctenidium contains afferent and efferent veins that go through the ctenidia hub.
- The body of the ctenidium gets deoxygenated blood from the body of the creature through the afferent vein and after oxygenation in the gill filaments the oxygenated blood is sent back to the heart through the efferent vein.
- Monopectinate type: This kind of ctenidia comprises of leveled gill fibers organized in just single side of the ctenidial pivot as saw in Pila, Triton.