Short essay on nervous system

That is, in complicated responses, central nervous system is involved. Nerves that release Ach are said to be cholinergic. The dendrites pick up the nerve impulses or messages from receptors.

It is the control system for all our actions, thinking and behaviour. The nervous system helps all other systems of our body to work together. The transmission of the nerve impulse across junctions such as synapses occurs through the release of humoral chemical messenger from the prejunctional nerve endings, which bridges the gap at the synapses, and thus activates a receptor in the organ supplied or in another nerve cell.

The longest fibre on the cell body of a neuron is called axon. The central nervous system will consider the two messages together. It also enables us to make precise and accurate movements. Sympathetic activity is initiated from the reticular formation of Short essay on nervous system medulla oblongata and pons and from centres in hypothalamus.

Nicotine, the classic agonist, first stimulates and then blocks autonomic ganglia and skeletal muscle end plates; d-tubocurarine blocks nicotinic receptors, particularly in skeletal muscles and autonomic ganglia, whereas hexamethonium preferentially blocks autonomic ganglionic receptors.

It is protected by a bony box in the skull called cranium. At two places it adhered to the roof surface of brain to form choroid plexus for secreting cerebrospinal fluid CSF.

We will now explain how nerve impulses or messages are transferred from one neuron to another in the nervous system. This is an example of voluntary action and the decision to take this voluntary action has been made by the voluntary nervous system. COMT causes rapid methylation of catecholamines.

The autonomic neurons located in the ganglia outside the central nervous system give rise to the postganglionic autonomic nerves that innervate the viscera. They have a higher affinity for adrenaline than for noradrenaline and are responsible for bronchial muscle relaxation, skeletal muscle vasodilation and uterine relaxation.

Preganglionic sympathetic nerve fibers leave the spinal cord between the first thoracic and the second lumbar segments. The brain is broadly divided into three regions: The nervous system is like a manager inside our body.

Responses to the sympathetic and the parasympathetic stimulation are frequently antagonistic as exemplified by the in opposing effects on the heart rate and gut motility. The brain stores 'information' so that behaviour can be modified according to the past experience.

It lines the cranial cavity. In addition to autonomic nervous system, Ach is the neurotransmitter at the somatic nerves supplying the skeletal muscles neuromuscular junction.

We can do this because of our voluntary nervous system as follows: A number of long and thin fibres are stretching out from the cell body of a neuron.

Essay on the Autonomic Nervous System | Vertebrates | Biology

It is enclosed in a bony cage called vertebral column. We will now understand the conduction of electrical nerve impulses through synapse with the help of a diagram.

Before we end this discussion, we would like to give the various functions of brain. Now, it is here that the central nervous system involving brain steps in. It consists of brain and spinal cord. It is the site of our faculties such as learning, reasoning, intelligence, personality and memory.

But if we pull away our hand, then the plate would drop and break into pieces and our mother will definitely scold us for breaking the plate! The activity of autonomic nerve is regulated by central neurons.

These are — 1.An essay or paper on Study of the Nervous System. The nervous system is one of the most complicated systems of the body. Along with the endocrine system, it controls many bodily activities through a. The Nervous System Essay.

The Nervous System is comprised of two subdivisions. The central nervous system is the coordinating system for the body. The peripheral nervous system is a very complex network of nerves that extend across the whole body. Both are vital to the human body and without either life would not exist.

The nervous system works.

Short essay on The Autonomic Nervous System

The autonomic nervous system (ANS) has a direct role in physical response to stress and is divided into the sympathetic nervous system (SNS), and the parasympathetic nervous system (PNS). When the body is stressed, the SNS generates what is known as the "fight or flight" response.

Essay on Human Nervous System (533 Words)

Compare and contrast the two divisions of the Autonomic Nervous System; the sympathetic and parasympathetic divisions. words please need by june 6th please Submitted: 6 years ago.

Category: Short Essay (2 pages or less). The Unit of Nervous System: Neuron: The units which make up the nervous system are called nerve cells or neurons. So, neuron is the structural and functional unit of the nervous system. We can now say that nervous system is made of special cells called neurons.

Neuron is the largest cell in the body (which looks like an electric wire). The Nervous System Essay. The Nervous System is comprised of two subdivisions. The central nervous system is the coordinating system for the body. The peripheral nervous system is a very complex network of nerves that extend across the whole body.

Both are vital to the human body and without either life would not exist.

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Short essay on nervous system
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