A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.
Acetylcholine. Acetylcholine (ACh) is the transmitter released by the preganglionic nerve terminals of both the sympathetic and the parasympathetic divisions (Fig 6.2). The synapse at those sites utilizes a nicotinic receptor similar in structure to the receptor at the neuromuscular junction.
Split and merge into it. Answered by The Community. Making the world better, one answer at a time. a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.Presynaptic neurons release the neurotransmitter in response to an  action potential. Postsynaptic neurons receive the neurotransmitter  (and can however become presynapt â¦ ic to the next nerve cell, if the  neurotransmitter has stimulated the cell enough). . 2 people found this useful.