NEET Biology Structural Organisation In Animals Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

Answer: (a)

Mast cells are large cells with densely granular cytoplasm that are found in connective tissues. Their granules contain histamine which is a vasodilator, heparin which is an anticoagulant and serotonin which acts as a mediator of inflammation and allergic reactions. Vasopressin is a hormone secreted by the posterior pituitary gland. Calcitonin is a hormone secreted by the thyroid gland. Melanin is a pigment produced by specialized epidermal cells called melanocytes. Relaxin is a hormone produced by the corpus luteum and placenta during the terminal stages of pregnancy.