Describe the method by which nautiloids regulate their buoyancy

What will be an ideal response?


Tissue called the siphuncle extends into the chambers of the nautiloid shell. This tissue first removes salts from the seawater in the chambers by actively pumping these salts against a concentration gradient. Next, the dilute water remaining in the chambers moves into the siphuncle tissue by osmosis and it is replaced by metabolic gases that diffuse out of the siphuncle. The animal can control how much gas diffuses into or out of the siphuncle, thereby regulating buoyancy.

Biology & Microbiology

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