MICROANATOMY

Detailed explanation-1: -Potassium ions, hydrogen ions and amnonium ions.

Detailed explanation-2: -Substances mainly secreted into renal tubule are; H+, K+, NH3, urea, Creatinine, histamine and drugs like penicillin.

Detailed explanation-3: -Most of the reabsorption of solutes necessary for normal body function, such as amino acids, glucose, and salts, takes place in the proximal part of the tubule. This reabsorption may be active, as in the case of glucose, amino acids, and peptides, whereas water, chloride, and other ions are passively reabsorbed.

Detailed explanation-4: -Tubular secretion is the opposite process, where the kidneys secrete waste products, such as excess potassium or hydrogen ions, from the bloodstream into the tubular fluid. This process occurs primarily in the distal and collecting tubules of the nephron.