Acetylcholine (ACh) is a neurotransmitter that plays a vital role in the central and peripheral nervous systems.

Amino acids are organic compounds that serve as the building blocks of proteins and play crucial roles in various biological processes.

An analgesic is a type of drug that is used to relieve pain.

The Wikipedia page on Arteries provides an in-depth overview of the major blood vessels in the human body that carry oxygenated blood from the heart to the various organs and tissues.

Birds are a group of warm-blooded vertebrates characterized by feathers, beaks, wings, and the ability to lay eggs.

A computed tomography (CT) scan, also known as a CAT scan, is a medical imaging technique that uses x-rays and computer processing to create detailed cross-sectional images of the body.

Cystic fibrosis (CF) is a genetic disorder that primarily affects the lungs and digestive system.

Diabetes mellitus is a chronic metabolic disorder characterized by high blood sugar levels over a prolonged period of time.