What happens to your acetylcholine when you stumble?

Answer 1

from answers.com

When a nerve impulse reaches an axon ending, voltage-gated calcium channels in the axonal membrane open and calcium, which is extremely low inside the cell, enters the nerve ending. The increase in calcium-ion concentration causes hundreds of synaptic vesicles to fuse with the cell membrane and expel acetylcholine into the synaptic cleft (exocytosis). The acetylcholine released at a neuromuscular junction binds reversibly to acetylcholine receptors in the muscle end-plate membrane, a postsynaptic membrane that is separated from the nerve ending by a very short distance. The receptor is a cation channel which opens when two acetylcholine molecules are bound, allowing a sodium current to enter the muscle cell and depolarize the membrane. The resulting impulse indirectly causes the muscle to contract.

Answer 2

When you stumble, increased activity in the brain triggers the release of acetylcholine, leading to improved focus, attention, and decision-making to help prevent falls or minimize injury. This increased release of acetylcholine enhances muscle coordination and balance by activating motor neurons which help bring stability to the body.