Q.Basophils secrete substances such as:

Normal fasting blood glucose in a healthy person is about 70-110 mg/dL, maintained by the balance of insulin and glucagon.

Blood glucose level is tightly regulated by hormones from the islets of Langerhans in the pancreas:

• Insulin (from beta cells) lowers blood glucose by promoting its uptake into cells and conversion to glycogen (glycogenesis).
• Glucagon (from alpha cells) raises blood glucose by promoting glycogen breakdown (glycogenolysis) and glucose synthesis (gluconeogenesis). …

White blood cells are classified as granulocytes (cytoplasm with visible granules: Neutrophils, Eosinophils, Basophils) and agranulocytes (no visible granules: Lymphocytes, Monocytes) — the granular ones are Neutrophils, Eosinophils and Basophils, option (d).

Leukocytes (WBCs) are divided into two broad categories based on the presence or absence of cytoplasmic granules:

• Granulocytes (granular WBCs): Neutrophils, Eosinophils, and Basophils. Each has a distinctively lobed nucleus and stainable granules in the cytoplasm.
• Agranulocytes (agranular WBCs): Lymphocytes and Monocytes, which lack visible cytoplasmic granules and have a rounder, less-lobed nucleus. …

Haematology is the branch of biology/medicine dedicated to the study of blood.

Haematology covers the formation (haematopoiesis), composition, structure, and functions of blood and its cellular elements — red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes) — as well as blood-forming org …

Basophils release heparin (an anticoagulant), serotonin, and histamine (both involved in inflammatory/allergic responses) from their granules.

Basophils are the least abundant type of granulocyte in blood, structurally and functionally similar to mast cells. Their cytoplasmic granules classically contain:

• Heparin — an anticoagulant that prevents blood clotting.
• Histamine — a vasodilator that increases capillary permeability, central to allergic and inflammatory reactions.
• Serotonin — also involved in vascular/inflammatory responses. …