#hormone

• Adenohypophysis — The anterior lobe of the pituitary gland, of ectodermal origin, with a highly specialized epithelial glandular structure; adenohypophysis. This major component of the endocrine system synthesizes and secretes fundamental tropic hormones into the bloodstream that control somatic growth, thyroid function, adrenal gland activity, and reproductive system dynamics, being directly regulated by hypothalamic neurohormones.
• Anterior pituitary — Pertaining to the anterior pituitary gland (the anterior lobe of the pituitary gland) or secreted by it; adenohypophyseal. The term describes cellular structures, vascular processes, or specific hormones (such as STH, ACTH, TSH, FSH, LH) responsible for regulating the activity of other endocrine glands and general metabolism.
• Anaphrodisiac — A chemical substance, food, medication, or psychological factor capable of diminishing, inhibiting, or suppressing sexual desire (libido). In clinical pharmacology, they act by reducing androgen levels or altering central neurotransmitters.
• Antihormone — A natural or synthetic substance capable of inhibiting or completely neutralizing the biological action of a specific hormone in the organism. In a structural sense, it acts as a competitive antagonist, blocking cellular hormone receptors or directly disrupting the synthesis, secretion, or transport of the respective hormone in the bloodstream.
• Antithyroid — Diminishing, blocking, or regulating the excessive secretion of thyroid gland hormones; a medication or active substance (such as thiamazole or propylthiouracil) used in the therapy of hyperthyroidism and Graves' disease. These compounds intervene directly in the synthesis of organified iodine or inhibit the coupling of iodotyrosines, thereby reducing thyroxine and triiodothyronine synthesis to restore a state of euthyroidism.
• Autotropism — A spontaneous and autonomous tendency of certain plant organs (shoots, roots) to return to their original direction or to a rectilinear growth pattern after the curvature caused by an external factor (such as light or gravity) has ceased to act. This biomechanical structural phenomenon is governed by asymmetric internal hormonal adjustments, ensuring the plant's optimal balance and spatial orientation.
• Auxin — A plant hormone (phytohormone) secreted by the apical meristematic tissues of plants, possessing the fundamental property of stimulating cell elongation, root initiation, fruit development, and the orientation of plant tropisms; indole-3-acetic acid is the most common natural representative of this class.
• Growth therapy — A medical method or therapeutic protocol focused on treating severe physical and stature development deficiencies in children and adolescents, primarily consisting of the controlled administration of growth hormone and the optimization of nutritional factors to stimulate skeletal elongation.