Question

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which substances are actively transported from the blood into the filtrate through tubular secretion?
carbon dioxide and oxygen molecules
sodium ions and chloride ions
calcium ions and magnesium ions
hydrogen ions, potassium ions, and certain drugs.
glucose and amino acids

Explanation:

Tubular secretion is an active - transport process. Hydrogen ions (\(H^{+}\)), potassium ions (\(K^{+}\)), and certain drugs are actively transported from the blood into the filtrate. Carbon dioxide (\(CO_{2}\)) and oxygen (\(O_{2}\)) are transported by diffusion. Sodium (\(Na^{+}\)) and chloride (\(Cl^{-}\)) ions are mainly reabsorbed. Calcium (\(Ca^{2 +}\)) and magnesium (\(Mg^{2+}\)) ions are also mostly reabsorbed. Glucose and amino acids are reabsorbed by the proximal convoluted tubule.

Answer:

Hydrogen ions, potassium ions, and certain drugs.