Research has pointed to a compound called acetylcholine as the reason.

We'll have to take on the electric charge pattern of acetylcholine.

The researchers' hypothesis is that acetylcholine promotes the brain's activities.

This message is transmitted to the muscle by a substance called acetylcholine.

They may also act on the synthesis, release, and enzymes of acetylcholine.

Eventually, stored acetylcholine is made available, and the amplitudes increase again.

Following on from such work it was suggested that drugs which tend to increase the activity of acetylcholine might improve learning and memory.

Let's just consider a few important examples, probably the most famous of which is the acetylcholine receptor.

All work by stimulating acetylcholine levels in the brain.

As we get older, our supply of acetylcholine decreases.

Nicotine appears to enhance attention and memory due to the increase of acetylcholine.

These structures are important in the production of acetylcholine, which is then distributed widely throughout the brain.

Moreover, acetylcholine is used by the nerves to activate muscles.

This illustration shows how the neurotransmitter acetylcholine works in the nerves.

The chemical that delivers the message is called acetylcholine.

These findings are attributed to the important role played by acetylcholine in the maintenance of selective attention.

His work on acetylcholine synthesis, storage and release is recognized internationally.

But it can only work as long as there are enough brain cells left to produce the acetylcholine.

Over time, too much adrenaline and too little acetylcholine can lead to a host of problems.

All nerve cells contain the enzymes that form acetylcholine and break it down.

In all cases, the predicted binding energies are better than for nicotine or acetylcholine.

Increasing the amount of acetylcholine appears to slow mental decline in people with Alzheimer's disease.

This medication works by blocking the actions of a certain natural substance (acetylcholine) that your body makes.

These types of medications help increase the levels of acetylcholine in the brain.

It is a matter of hours to days, opposed to that of acetylcholine, which occurs within a second.