The hormone that regulates blood pressure and it is secreted by. -

Blood pressure is regulated by several hormones, most notably adrenaline (epinephrine) and noradrenaline, which are secreted by the adrenal glands [3]. Adrenaline is produced in the adrenal medulla, the inner part of the gland, and is released during stress or 'fight-or-flight' responses [t1][t5]. It increases heart rate and constricts blood vessels, thereby raising blood pressure [t4][t8]. While other hormones like aldosterone (from the adrenal cortex) and renin (from the kidneys) also play critical roles in long-term blood pressure regulation via the Renin-Angiotensin-Aldosterone System (RAAS), the option pairing 'adrenaline' with 'adrenaline glands' (adrenal glands) correctly identifies a primary regulatory hormone and its source [t3][t6]. Other options are incorrect because insulin regulates blood sugar [c2], thyroxin regulates metabolism [c1], and epinephrine is secreted by the adrenal glands, not the kidneys [t2].

Sources

1. [3] Science , class X (NCERT 2025 ed.) > Chapter 6: Control and Coordination > 6.3 HORMONES IN ANIMALS > p. 109