Problem 2 - Biology: The Dynamic Science

Question

One role of tubules in excretion is to: a. absorb \(\mathrm{H}^{+}\) ions to buffer body fluids. b. transport proteins across transport epithelium. c. reabsorb ghicose and amino acids. d. move toxic substances from the filtrate into the cells composing the transport tubules. e. filter by maintaining a lower pressure in the fluid outside the tubule than inside it.

Step-by-Step Solution

Answer

The correct answer is c. 'reabsorbing glucose and amino acids'. Tubules in excretion play a crucial role in the reabsorption of such useful molecules.

Step 1: Understand the role of Tubules

Tubules play a significant role in the kidneys for filtering waste materials from the body. They are involved in the reabsorption of useful substances back into the bloodstream and secretion of waste products to filtrate.

Step 2: Evaluate the options

Looking at the options: a. tubules do assist in the absorption of \(\mathrm{H}^{+}\) ions but not specifically for buffering body fluids. b. tubules are not the primary means of protein transport across the transport epithelium. d. tubules do help in the removal of certain substances but not by moving toxic substances from the filtrate into the cells composing the transport tubules. e. tubules help in filtration but this doesn't involve maintaining a lower pressure outside than inside.

Step 3: Choose the correct answer

After reviewing all the options, c. 'reabsorbing glucose and amino acids' stands out as the most accurate role of tubules in excretion as they effectively reabsorb beneficial molecules like glucose and amino acids during the process of filtration.