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.
In summary, excite the muscle cell. In a little more detailed summary, acetylcholine is a neurotransmitter that reversibly binds to and stimulates the muscarinic acetylcholi â¦ ne receptors on the post-synaptic region of the sarcolemma of the skeletal muscle, called the motor end plate.