ACh (acetylcholine)
ACh (acetylcholine): Abbreviation for acetylcholine. See: Acetylcholine.
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- Achalasia
A disease of the esophagus that mainly affects young adults. Abnormal function of nerves and muscles of the esophagus causes difficulty swallowing and sometimes chest pain. Regurgitation of undigested food can occur, as can coughing or breathing problems related to entry of food material into the lungs. The underlying problems are weakness of the lower […]
- AChE (acetylcholinesterase)
AChE (acetylcholinesterase): Abbreviation for acetylcholinesterase. See: Acetylcholinesterase.
- Achilles tendonitis
Achilles tendonitis: Inflammation in the tendon of the calf muscle, where it attaches to the heel bone. Achilles tendonitis causes pain and stiffness at the back of the leg, near the heel. Achilles tendonitis can be caused by overuse of the Achilles tendon, overly tight calf muscles or Achilles tendons, excess uphill running, a sudden […]
- Achilles tendon
Achilles tendon: One of the longest tendons in the body, a tough sinew that attaches the calf muscle to the back of the heel bone (calcaneus). The name comes from Greek mythology: The hero Achilles was invulnerable to injury except for his heel, which proved his downfall when it was pierced by Paris’s arrow. It […]
- Achillobursitis
Achillobursitis: Pain due to inflammation of the bursa associated with the Achilles tendon. . The Achilles tendon is one of the better known anatomic features in sports medicine due to the abrupt dramatic nature of some injuries to this tendon. It is in the back of the lower leg and connects the calf muscle (the […]