Some speed it up while others slow it down.
c
nerve cells
It slows their action.
Drinking alcohol, even in excessive amounts, does not kill brain cells. However, alcohol slows our reactions, respiration, heart rate, etc.
Only the nerve cells, yes.
Neurotransmission
Drugs are chemicals. They work in the brain by tapping into the brain's communication system and interfering with the way nerve cells normally send, receive, and process information. Some drugs, such as marijuana and heroin, can activate neurons because their chemical structure mimics that of a natural neurotransmitter. This similarity in structure "fools" receptors and allows the drugs to lock onto and activate the nerve cells. Although these drugs mimic brain chemicals, they don't activate nerve cells in the same way as a natural neurotransmitter, and they lead to abnormal messages being transmitted through the network. Other drugs, such as amphetamine or cocaine, can cause the nerve cells to release abnormally large amounts of natural neurotransmitters or prevent the normal recycling of these brain chemicals. This disruption produces a greatly amplified message, ultimately disrupting communication channels. The difference in effect can be described as the difference between someone whispering into your ear and someone shouting into a microphone.
Dopamine is produced by nerve cells in the brain. There is no dopamine gland.
Connector nerve cells connect the sensory nerve cells with motor nerve cells and allow for decision making.
a nerve tends to refer to a group of nerve cells.
True. A+
Some cells have a greatly, or even completely, deminished ability to reproduce once they become specialized. Muscle and nerve cells are a prime example of this.