Adrenaline, also known as epinephrine, is a hormone and medication which is involved in regulating visceral functions (e.g., respiration).

• Lieberman M, Marks A, Peet A (2013). Marks’ Basic Medical Biochemistry: A Clinical Approach (4th ed.). Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 175. ISBN 9781608315727.
• “Adrenaline”. 21 August 2015.
• Malenka RC, Nestler EJ, Hyman SE (2009). “Chapter 6: Widely Projecting Systems: Monoamines, Acetylcholine, and Orexin”. In Sydor A, Brown RY (eds.). Molecular Neuropharmacology: A Foundation for Clinical Neuroscience (2nd ed.). New York, USA: McGraw-Hill Medical. p. 157. ISBN 9780071481274. Epinephrine occurs in only a small number of central neurons, all located in the medulla. Epinephrine is involved in visceral functions, such as the control of respiration. It is also produced by the adrenal medulla.

It appears as a white microcrystalline granule. Adrenaline is normally produced by the adrenal glands and by a small number of neurons in the medulla oblongata. It plays an essential role in the fight-or-flight response by increasing blood flow to muscles, heart output by acting on the SA node,pupil dilation response, and blood sugar level. It does this by binding to alpha and beta receptors. It is found in many animals, including humans, and some single-celled organisms.

• Larrañaga, M (2016). Hawley’s Condensed Chemical Dictionary. New Jersey: John Wiley & Sons, Incorporated. p. 561.
• “Adrenaline: physiology and pharmacology | DermNet”. dermnetnz.org. Retrieved 20 March 2023.
• Brown HF, DiFrancesco D, Noble SJ (July 1979). “How does adrenaline accelerate the heart?”. Nature. 280 (5719): 235–236. Bibcode:1979Natur.280..235B. doi:10.1038/280235a0. PMID 450140. S2CID 4350616.
• Bell DR (2009). Medical physiology : principles for clinical medicine (3rd ed.). Philadelphia: Lippincott Williams & Wilkins. p. 312. ISBN 9780781768528.
• Khurana I (2008). Essentials of Medical Physiology. Elsevier India. p. 460. ISBN 9788131215661.
• Buckley E (2013). Venomous Animals and Their Venoms: Venomous Vertebrates. Elsevier. p. 478. ISBN 9781483262888.
• Animal Physiology: Adaptation and Environment (5th ed.). Cambridge University Press. 1997. p. 510. ISBN 9781107268500.