Question

Tubular secretion helps to maintain a proper acid-base balance by removing one of the following from the blood.

Answer 1

Hint: As we understand from the term tubular secretion means the secretion taking place in kidneys. And the tubules we are going to discuss are proximal convoluted tubule and distal convoluted tubule commonly known as PCT and DCT. So, secretions which happen in the PCT of the nephron are responsible for transportation of certain types of molecules out of blood and into the urine. These substances include-ions, hydrogen ions and some biotics.

Complete answer:
Tubular secretion is one of the processes in the blood filtration process where it filters out blood to produce liquid waste in the form of urine. Within the excretory system of an organism, it is important to maintain the acid-base balance in the body of the organism. It is basically used to remove drugs, toxins and poisonous or natural compounds in excessive amounts. Such as potassium, hydrogen and urea.
As we already know that the location of tubules in humans and other vertebrates are in kidneys where the blood is filtered out by specialized carrying structures known as nephrons. So, these structures consist of long tubules surrounded by extensive capillaries. The secreted substances come from the blood in peritubular capillaries and pass through the interstitial fluid before going through the wall of the tubule known for the transport epithelium.
Tube secretion mechanism - Many substances in the renal move through diffusion and osmotic gradients between the different regions of the nephron, but active transportation is used to secrete tubes. Different types of conveyor proteins in the membrane. These conveyors transfer various substances into the tubular lumen and require energy in the form of ATP.
The kidneys have two ways to maintain acid-base balance in the body -their cells reabsorb bicarbonate \[HC{O_3}\] from the urine back to the blood and they secrete hydrogen ions into the urine. In this way they balance out the bloodstream’s pH. kidneys maintain homeostasis through the waste products. Two terms Acidosis causes more bicarbonate to be reabsorbed from the tubular fluid while the collecting ducts secrete more hydrogen to generate more bicarbonate and more \[N{H_3}\] buffer is formed.
The kidney excretes more bicarbonate as hydrogen ions become less secreted and more ammonium is excreted with a further term alkalosis. so, ammonium ions, protons and potassium ions are secreted into the tubular lumen fluid which helps in maintaining the acid-base balance.

Note:
Acid-base balance refers to the process the body uses to keep its fluids close to neutral ph. that can be acid, basic or neutral. So that the body can function normally.it is crucial to maintain the body's homeostatic movement to avoid infections or any serious illness or health condition. So, it is important to eliminate toxins from the body.