Question

Amino acid is freely filtered, 100% reabsorbed, and 0% secreted by the kidney. Which statement is true about filtration, reabsorption, secretion, and excretion of amino acids by the kidneys?

A) Filtration exceeds reabsorption
B) Secretion exceeds filtration
C) Reabsorption exceeds filtration
D) Excretion exceeds reabsorption

Answer 1

The true statement is that reabsorption of amino acids by the kidneys exceeds the amount filtered, as amino acids are 100% reabsorbed to maintain homeostatic plasma concentrations.

Step-by-step explanation:

The statement that is true about the filtration, reabsorption, secretion, and excretion of amino acids by the kidneys is C) Reabsorption exceeds filtration.

Amino acids are freely filtered by the glomerulus and then 100% reabsorbed by the renal tubules, and there is no secretion into the filtrate.

Reabsorption occurs mainly in the proximal convoluted tubule (PCT) and is essential to maintain homeostatic plasma concentrations of substances which are critical for the body's functioning.

The kidneys play a crucial role in maintaining homeostasis by filtering waste and reabsorbing needed substances, including amino acids, back into the blood circulation.

Answer 2

The true statement about the renal processing of amino acids is that 'Reabsorption exceeds filtration' because amino acids are freely filtered and then completely reabsorbed, with no secretion occurring, ensuring no loss of amino acids through excretion. Option C) Reabsorption exceeds filtration is the correct answer.

Step-by-step explanation:

The question regarding the filtration, reabsorption, secretion, and excretion of amino acids by the kidneys can be answered by understanding the basic functions of the nephron, which is the functional unit of the kidney.

Amino acid reabsorption is particularly efficient in the kidneys. Since amino acids are freely filtered and then 100% reabsorbed back into the bloodstream and 0% secreted into the filtrate, this ensures that valuable amino acids are conserved and not lost in the urine.

Therefore, the statement that is true about the process of amino acids by the kidney is:

'C) Reabsorption exceeds filtration'. Essentially, this indicates that the filter capacity of the kidney for amino acids is completely balanced by the reabsorption process, with no excess being excreted or wasted.