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Ch. 40 - Water and Electrolyte Balance in Animals
Freeman - Biological Science 8th Edition
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoFreeman 8th EditionCh. 40 - Water and Electrolyte Balance in AnimalsProblema 6
Capitolo 40, Problema 6

The chloride cells of fish gills have a high density of mitochondria. How does this characteristic relate to the functional role of chloride cells?
Would you expect other epithelial cells involved in ion transport to contain large numbers of mitochondria? Explain.

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Chloride cells in fish gills are specialized epithelial cells responsible for ion transport, particularly the exchange of chloride ions. This process is energy-intensive, requiring ATP to drive active transport mechanisms.
Mitochondria are the organelles within cells that produce ATP through cellular respiration. A high density of mitochondria in chloride cells indicates a high demand for energy to support the active transport of ions against their concentration gradients.
The presence of numerous mitochondria ensures that chloride cells have sufficient ATP to power ion pumps, such as the Na+/K+ ATPase and other transporters involved in maintaining ionic balance in the fish's body.
Other epithelial cells involved in ion transport, such as those in the kidney or intestinal lining, would also be expected to contain large numbers of mitochondria. This is because they similarly require substantial energy to perform active transport of ions and maintain homeostasis.
In summary, the high density of mitochondria in chloride cells and other ion-transporting epithelial cells is directly related to their functional role in energy-demanding processes of active ion transport.

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Chloride Cells Function

Chloride cells, located in the gills of fish, are specialized epithelial cells responsible for ion regulation, particularly the excretion of excess salts. They play a crucial role in maintaining osmotic balance by actively transporting ions like chloride and sodium against concentration gradients, which is essential for fish living in varying salinity environments.
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Cell Junctions

Role of Mitochondria in Ion Transport

Mitochondria are the powerhouse of the cell, providing ATP necessary for active transport processes. In chloride cells, the high density of mitochondria supports the energy-intensive task of ion transport, enabling the cells to maintain ion gradients across the gill epithelium. This is vital for the active transport mechanisms that require substantial energy input.
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Mitochondria

Epithelial Cells and Ion Transport

Epithelial cells involved in ion transport, like those in the kidney or intestinal lining, often contain numerous mitochondria due to their role in active transport. These cells require significant energy to move ions against concentration gradients, similar to chloride cells in fish gills, indicating a common physiological adaptation for efficient ion regulation across different organisms.
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