The enzyme pepsin is secreted by which cells of the gastric glands? MCQ with Answer and Explanation

Explanation:
Iron (Fe²⁺) is the central atom of heme in hemoglobin and myoglobin, essential for oxygen transport. Deficiency leads to microcytic hypochromic anemia. Good sources: liver, meat, leafy greens.

Explanation:
Charles Darwin proposed the theory of evolution by natural selection, emphasizing that organisms with favorable variations are more likely to survive and reproduce. Hugo de Vries, a Dutch botanist, proposed the mutation theory of evolution based on his work on evening primrose, stating that evolution occurs through sudden, large mutations (saltations). Jean-Baptiste Lamarck proposed the theory of inheritance of acquired characters, based on the use and disuse of organs (e.g., giraffe's neck). All statements are correct.

Explanation:
Tubular reabsorption occurs mainly in the proximal convoluted tubule, where essential substances like glucose, amino acids, and most water are reabsorbed into peritubular capillaries via active and passive transport. Glomerular filtration/ultrafiltration is the initial passive filtration of blood. Tubular secretion adds substances like H⁺ and K⁺ to filtrate.