Two Main Parts of the Nervous System

Categories: Nervous System

The nervous system (NS) is the most important part of the body. A neuron is a nerve cell. The nervous system is split into two main parts. The first part is the central nervous system. The second part is the peripheral nervous system. The neuron systems function is to send and receive signals. A neuron is made of many different parts. The dendrites collect the signals and send it to the cell body. The cell body redirects the signal down to the axen.

The axen then sends the signal through the myelin sheath to protect the neurons from touching each other. Then the signal goes to the synaptic terminal. The terminals contain neurotransmitter molecules which cross the gap or the synapse, Which transports it to the next neuron. There are many different types of neurons in the nervous system. There are three main types. The bipolar, unipolar, and the multipolar.

The bipolar is found in the peridural nervous system. The bipolar neurons control your five senses, sensory, and skeletal motors.

The unipolar is found in the spinal cord. The unipolar’s function is to control the interneuron. The multipolar is located in the brain. The multipolar’s function is to store memories. The purpose of a neuron is to send and receive signals. Neurotransmitter molecules attach to receptor sites. After, that the sodium gate opens. The sodium receptor sites open. But right when it is there it closes. Then another one opens and this happens so many times that it goes to max speed.

Top Writers
Academic Giant
Verified expert
5 (345)
Verified expert
5 (298)
Prof. Laser
Verified expert
4.8 (435)
hire verified writer

When it is at max speed which is positive 30 millivolts. It bursts into the terminal and pushes the molecules. And jumps the gap to the next neuron. Then the process repeats over again throughout the entire nervous system. The nervous system has many ways of keeping healthy. There are support cells to help support the system for example, if a person gets injured in their peripheral nervous system only. The neuron can regenerate. But it can only grow 2 to 4 millimeters a day. There are toxins all around us that affect our NS all the time. Even though your NS can heal toxins or poisons affect them. Nature provides a way of defending its and to use against prey. For example, poisonous frogs shoot out poison and can block voltage-gated calcium channels.

People created chemicals to protect their crops by spraying it on. But that’s not good enough if you’re going to war you have to change it so instead of effecting caterpillars it affects humans. In addition to the chemical effects from the nuclear warfare, you can still get over the counter medication. For example, there is caffeine that is found in chocolate. Cacao is found in South America, coffee from Egypt. Caffeine is a toxin that reduces drowsiness. There are also over the counter medicine such as cough syrup which is a depressant which slows down your nervous system. Alcohol may be the worlds oldest known drugs. It is a legal drug that is found in nature. But is illegal if you drink it underage or abuse it. It is a central nervous system depressant. Factors that change the way it affects you consists of age, gender, physical condition, amount of food eaten, and other drugs and medicine taken. In low doses, alcohol can result in a relaxing effect, reduce tension, lowers inhibitions, impaired concentration, slows reflexes, impairs reaction time, and reduced coordination.

In medium doses alcohol can result in slur speech, drowsiness, and altered emotions. In high doses, it can cause vomiting, breathing difficulties, unconsciousness, coma, and even death. Cocaine was first published in 1519. Cocaine is from a plant called coca that is found in the Andes mountains in Peru. It is a central NS stimulant. It can be inhaled or injected. Possible effects of cocaine include a feeling of euphoria, excitement, reduced hunger, a feeling of strength, dizziness, headache, movement problems, anxiety, insomnia, depression, hallucinations, and death. Amphetamines were first made to treat sleep disorders (narcolepsy). Amphetamines are central NS stimulants. The main action of them is to increase people’s alert and keep people awake. They can cause the release of dopamine from axon terminals, block dopamine reuptake, inhibit the storage of dopamine in vesicles, and/or inhibit the destruction of dopamine by enzymes. Short-term effects can include increased heart rate, increased blood pressure, reduced appetite, dilation of the pupils, feelings of happiness and power, reduced fatigue.

Long term use can result in insomnia, restlessness, paranoid psychosis, hallucination, violent and aggressive behavior, weight loss, tremors, and death. Nicotine is one of the most addicting drugs. It is found in tobacco and cigarettes. It used to be contained in Coca-Cola. It is from a plant called Nicotiana. It is a stimulant of the central NS. Rapid effects of nicotine include increases in blood pressure and heart rate, faster respiration. and/or constriction of arteries. It can also lead to lung cancer, lip cancer, throat cancer, respiratory problems and/or heart disease. It can also lead to addiction and/or death. Long term exposure can lead to anxiety, depression, headaches, and/or fatigue. Barbituates are often called sleeping pills. There are many different kinds of Barbituates. They are a central NS depressant. In low doses, Barbituates reduce anxiety, reduce respiration, reduce blood pressure, reduce rapid eye movement (REM) sleep. In higher doses, Barbituates can actually increase some types of behavior and act like a stimulant.

These effects are possibly caused by depression of inhibitory brain circuits. In other terms, Barbituates these doses act to remove inhibitory behavior. They can lead to excessive sedation and cause anesthesia, coma, and/or death. Overdoses may occur because the effective dose of the drug is not far away from the lethal dose. Inhalants are one of the easiest drugs to get. Inhalants are drugs that destroy your myelin sheath. Inhalants can be inhaled. Some different Inhalants and what they do are a lighter fluid which contains hydrocarbons, marker pens which contain toluene and xylene and many more. can cause relaxation, slurred speech, euphoria, hallucinations, drowsiness, dizziness, nausea, vomiting, death, memory loss, concentration problems, visual disturbances, blindness, motor problems, and/or peripheral nerve damage. Diacetylmorphine is the scientific term for heroin.

Cite this page

Two Main Parts of the Nervous System. (2021, Apr 22). Retrieved from

Are You on a Short Deadline? Let a Professional Expert Help You
Let’s chat?  We're online 24/7