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Pharmacology neurotransmitters
Pharmacology neurotransmitters
Functions and dysfunctions of neurotransmitters
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1. List a number of neurotransmitters and describe the part of the nervous system where each is found and the types(s) of behavior each influences. (Chapter 3)
A neurotransmitter is a chemical that is stored in the axon terminal buttons, and when the neuron fires it is released into the synapse where it interacts with the receptor. There are numerous neurotransmitters in the human nervous system. They control many different behaviors that we experience. The first neurotransmitter that scientists discovered was acetylcholine. Acetylcholine and dopamine are both involved in motor movements, memory, and learning. Acetylcholine is found in many different parts of the nervous system such as the autonomic, central, and peripheral nervous systems while dopamine is mostly found in the brain. When acetylcholine is released from motor neurons, it goes to the muscle fibers which make the muscles to contract. Science has linked acetylcholine to Alzheimer’s disease. Dopamine is also involved in motor movement, memory, and learning. Even though acetylcholine and dopamine are involved in the same processes they trigger different parts of the behavior. Dopamine initiates motor movement while acetylcholine causes the contraction. Lack of dopamine causes Parkinson’s disease which is a disease that causes tremors and uncontrolled movement.
Another neurotransmitter is serotonin; it is involved in the control of the cycle of sleeping and waking, mood, and appetite. Serotonin is found in the spinal cord and brain. When the body experiences deficiencies, sleep disorders, aggression, and depression can occur. Norepinephrine is an excitatory neurotransmitter in the brain, and is spread through the central and peripheral nervous systems. This neurotran...
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...233). Pavlovian conditioning has four parts: unconditioned stimulus, unconditioned response, conditioned stimulus, and conditioned response. Each of the four parts is associated to one another. The unconditioned stimulus automatically causes the unconditioned response. The conditioned stimulus after being trained can trigger the conditioned response.
In operant conditioning, there is an association between an individual’s behavior and its consequence. A consequence can either be reinforcement or punishment (233). Positive and negative reinforcements will increase the behavior. When an individual is reinforced, they will continue to repeat the behavior to receive the reinforcement again. Punishment, on the other hand, will decrease the behavior. If an individual is punished after a particular behavior, they will behave that way less often to avoid the punishment.
Briefly explain the process of neurotransmission. Neurotransmission starts with the neuron, the most important part of the central nervous system. A neuron contains a cell body, axon, and dendrites. When a neuron receives an electrical impulse, the impulse travels away from the cell body down the axon. The axon breaks off into axon terminals. At the axon terminals, the electrical impulse creates a neurotransmitter. The neurotransmitter is released into the synapse, a space between two neurons. If the neurotransmitter tries to stimulate a response of another neuron, it is an excitatory neurotransmitter. If the neurotransmitter does not stimulate a response of another neuron it is an inhibitory neurotransmitter. If a response is generated, the second neuron or postsynaptic neuron will receive an action potential at the site of the dendrite and the communication process will continue on. If a response is not generated, neurotransmitters left in the synapse will be absorbed by the first neuron or presynaptic neuron, a process known as reuptake. Neurotransmitters control our body functions, emotions, and
Operant conditioning explains that behaviors followed by positive outcomes are more likely to be repeated than behaviors followed by negative outcomes. Punishment, which is a part of operant conditioning, is something received or taken away from an individual decreasing the likihood that a behavior would be repeated. The best example from The Lion King of a punishment is when Nala ran away from Simba after he informed her that he was not returning to Pride Rock. Simba deeply loved Nala and he hoped she would agree with the Hakuna Matata philosopy that he was using to hide from his past. But she did not and ran from Simba after an argument. The fact that his true love did not want to be with him was a punishing blow to Simba, helping him rethink his worldview and preparing him for the meeting with
“Operant conditioning is a method of learning that occurs through rewards and punishments for behavior. Through operant conditioning, an association is made between a behavior and a consequence for that behavior” (Cherry). Positive reinforcement which is praising a person for doing something good verses negative reinforcement which is an unpleasant remark a punishment. B.F. Skinner did an experiment on a rat, the rat was taught to push two buttons, one to receive food and the other was a light electric shock. The rat tried both buttons and realized which button was good and which one was bad. This experiment goes to show that upon the rewards and punishment system one can learn their rights from their wrongs through a series of lessons. Kincaid and Hemingway both use operant conditioning to show human behavior under stimulus control.
He discovered classical conditioning after seeing how the dogs were stimulated to respond to their food and anything related to food such as the noise of the door or person coming towards them (King, 2016). He eventually conditioned the dogs to respond to a bell as it did when it was exposed to the food (King, 2016). Pavlov accomplished this by introducing a neutral stimulus, the bell, which is a stimulus that doesn’t result in a response like conditioned or unconditioned stimuli (King, 2016). Initially, in this experiment salivation was an innate response to food, but after the introduction of the bell, it became a conditioned response because the dog learned that every time the bell rang, its food came along with it (King, 2016). Consequently, making the bell a conditioned stimulus which is a stimulus that resulted in a response after many times that the neutral stimulus was presented with the food (King,
In the field of genetics, the study of the effect of various genes is imperative in translation and interpretation. As genetic coding influences phenotypic expression, the analysis of specific genes and any polymorphisms are relevant in a clinical setting. One such example is that of personality traits, which are believed to be influenced by specific neurotransmitters, known as catecholamines. Catecholamines are chemicals released by the adrenal glands in response to stress, and operate dually as hormones and neurotransmitters within the body. Commonly, catecholamines mediate functions within the central nervous system, including those of emotional responses and motor control. Inclusive of dopamine, epinephrine and norepinephrine, the secretion and metabolism of these chemicals is thought to impact upon various mental functions and behaviours.
In the brainstem, the most primitive part of the brain, lie clusters of serotonin neurons. The nerve fiber terminals of the serotonergic neurons extend all throughout the central nervous system from the cerebral cortex to the spinal cord. This neurotransmitter is responsible for controlling fundamental physiological aspects of the body. In the central nervous system (CNS), serotonin has widespread and often profound implications, including a role in sleep, appetite, memory, learning, temperature regulation, mood, sexual behavior, cardiovascular function, muscle contraction, and endocrine regulation. Not only does this bioamine control physiological aspects of the body, but it also has an involvement in behaviors like eating, sleeping and aggression. Serotonin has been noted to produce an inhibitory effect on the nervous system that calms, soothes and generates feelings of general contentment and satiation.
...d at the axon endings of motor neurons, where they stimulate the muscle fibers to contract. And they and their close relatives are produced by some glands such as the pituitary and the adrenal glands. In this chapter, we will review some of the most significant neurotransmitters.
The two main forms of conditioning, are classical conditioning (learning by association), and operant condition (learning from consequences).Classical conditioning, is the learning process in which one is conditioned (learns) to respond to a neutral stimulus as if it were a meaningful stimulus. In operant conditioning, learning occurs through associations made between a behavior and the consequence that follows.
Once the signal is sent, the ion balances out and becomes at rest. The electrical impulse that runs down the axon releases a chemical called acetylcholine, only one of many chemicals that transmits signals across the synapse. These substances are called neurotransmitters because they transmit data from one ...
Throughout the paper, they talked about how nicotinic receptors play a role in releasing different neurotransmitters.
Operant conditioning is a system of learning that transpires through punishment and rewards for behaviors (Kalat, 2011). Through this, a connection linking a behavior and a consequence is made. For instance a kid could be told that she will not get recess privileges if she talks in class. This possibility of being punished leads to decrease in disruptive behaviors from her. The major components of operant condition are punishment and reinforcement (Kalat, 2011).
Neurotransmitters can be thought as the chemical messengers specialized in communication between neurons. These chemical messages are wrapped up in synaptic vesicles that facilitate the travel across one neuron to another. These synaptic vesicles also provide protection when crossing to the synaptic cleft located on the receiving neuron. Once these neurotransmitters reach to the receiving end of the neuron, their synaptic vesicles release the neurotransmitter's inner-molecules into
Neurotransmitters are substances that allow the brain cells to communicate with each other. Serotonin and norepinephrine are the two most common forms of neurotransmitters. Too little serotonin mat cause many symptoms of depression including irritability, sleep loss, and anxiety. Too little norepinephrine may be responsible for fatigue and a sense of hopelessness. A person's genetic structure, environment, and personality are all factors that affect the balance of these chemicals.
Central nervous system: MedlinePlus Medical Encyclopedia. (n.d.). U.S National Library of Medicine. Retrieved May 22, 2014, from http://www.nlm.nih.gov/medlineplus/ency/article/002311.htm
Classical conditioning was discovered by Ivan Pavlov, which is when a neutral stimulus is paired with an unconditioned stimulus (McLeod, 2007). Pavlov began