Table 40.1
-The intercellular concentration of three electrolytes is compared with the concentration of these electrolytes in fluid eliminated from the shark rectal gland in Table 40.1. Based on the data, which of the following is a likely function of the rectal gland?

Question

Quizplus · Accepted Answer

The data in Table 40.1 shows that the concentration of Na+, K+, and Cl- in the fluid eliminated from the shark rectal gland is much higher than their intercellular concentrations, suggesting that the rectal gland is able to actively concentrate these electrolytes. This function is particularly important for sharks, which live in a seawater environment where they constantly lose water and electrolytes osmotically. Option A, regarding the elimination of metabolic waste, is not supported by the data in the table. Option C, stating that there is very little potassium in sharks, is not supported by any evidence. Option D, regarding chloride levels in seawater and shark tissues, is not directly addressed by the data in the table.

Table 40.1 -The Intercellular Concentration of Three Electrolytes Is Compared with the with the Concentration