The gland in the human body related to the stimulation of the body is (d) Pituitary gland. Often referred to as the “master gland,” the pituitary gland secretes several hormones that control other endocrine glands throughout the body. These hormones regulate growth, metabolism, reproduction, and stress responses. Additionally, the pituitary gland produces hormones that stimulate the production of thyroid hormones, adrenal hormones, and sex hormones. Overall, the pituitary gland plays a crucial role in coordinating and regulating various physiological processes, ensuring the body’s proper functioning and response to internal and external stimuli.