Earthworm nephridia communicate with the coelomic cavity via openings known as_________?
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Answer: A. Nephrostome
Explanation
The nephrostome is the ciliated funnel-shaped opening of an earthworm nephridium communicating with coelomic cavities. Coelomic fluid enters through this specialized opening, allowing metabolic wastes to be filtered out. Cilia lining the nephrostome beat rhythmically to propel fluid into the excretory tubule system. Earthworms possess metanephridia as segmented excretory organs responsible for osmoregulation and waste removal. Fluid entering the nephrostome passes through coiled tubules where useful solutes are reabsorbed. The filtered waste products are eventually expelled to the exterior through a separate nephridiopore.
Anatomical studies of annelid excretory systems illustrate the evolutionary development of filtration kidneys. Understanding invertebrate nephridia provides comparative physiological insights into vertebrate renal system evolution. Soil health monitoring sometimes includes assessing earthworm physiological responses to environmental toxins. Nephridiopore is the external opening where filtered wastes exit rather than communicating with the coelomic cavity. Flame cells are specialized excretory cells found in flatworms rather than segmented earthworm nephridia. Anus is the terminal opening of the digestive tract rather than a component of the excretory system.
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