A neuron or nerve cell has three components: It can then be transferred to a third neuron in a similar way. The units which make up the nervous system are called nerve cells or neurons.
In this way, synapses ensure that nerve impulses travel in only one direction through a particular set of neurons.
The messages which the neurons transmit in the nervous system are in the form of electrical impulses called nerve impulses or just impulses. The human nervous system receives information from the surroundings, processes it, interprets it and then responds accordingly.
The receptor in a sense organ is in touch with the dendrites of sensory neuron. The nerve impulses are carried over this small gap between a pair of neurons by means of a chemical substance called neurotransmitter substance.
This process goes on till the electrical impulse reaches the relay neurons in spinal cord and brain. At the end of axon of sensory neuron A, the electrical impulse releases tiny amount of a chemical substance into the synapse or gap.
We will now understand the conduction of electrical nerve impulses through synapse with the help of a diagram.
The dendrites pick up the nerve impulses or messages from receptors. The longest fibre on the cell body of a neuron is called axon. Suppose there are two neurous or nerve cells A and B near each other. The axon passes the impulse or message to another neuron through a junction called synapse.
Neurons contain the same basic parts as any other animal cell but their structure is specially adapted to be able to carry messages over large distances in the body quickly. Let A be a sensory neuron which is directly connected to the receptor.
The nervous system helps all other systems of our body to work together. There is always a very, very small gap between the two neurons where they join. They pass the impulses to the cell body and then along the axon.
This is because the chemical substance is present on only one side of the gap. The nervous system also passes information from one internal system to another. The shorter fibres on the body of a neuron are called dendrites.
The cell body of a neuron is like a typical animal cell which contains cytoplasm and a nucleus. For example, as soon as we put food in our mouth, it immediately causes the release of saliva from the salivary glands.
We will now explain how nerve impulses or messages are transferred from one neuron to another in the nervous system. A microscopic gap between a pair of adjacent neurons over which nerve impulses pass when going from one neuron to the next is called a synapse.
We can now say that nervous system is made of special cells called neurons. This chemical substance crosses the gap or synapse and starts a similar electrical impulse in the dendrite of the next neuron B. A number of long and thin fibres are stretching out from the cell body of a neuron.
Neuron is the largest cell in the body which looks like an electric wire. The neurons carry messages in the form of electrical signals called electrical impulses or nerve impulses.
The function of nervous system is to coordinate the activities of our body. Synapses actually act like one-way valves. The relay neurons and motor neurons connect in a similar way to bring electrical impulses from the brain and spinal cord to the effectors like muscles and glands.
This impulse travels from the dendrite of sensory neuron A to its cell body and then along its axon. From the dendrite, this electrical impulse is carried to the cell body and then to the end of axon of the second neuron.
Its job is to control and coordinate the parts of our body so that they work together, doing their job at the right time. The nervous system is like a manager inside our body.
There is an extremely small, microscopic gap between the end of the axon of neuron A and the dendrite of the next neuron B which is called a synapse We will now explain how the electrical impulse travels through the gap synapse between the two neurons.
Our nervous system coordinates muscles so that we can do things which need thinking like reading, writing, cycling or dancing. The Unit of Nervous System:Short essay on Human Nervous System Sensory neurons transmit impulses from the sensory cells (or receptors) towards the central nervous system (spinal cord and brain).
Short essay on the value of Games; Here is your. Central Nervous System The CNS is comprised of the brain and the spinal cord that make up a large part of the entire nervous system.
The spinal cord is. The nervous system consists of the central nervous system (CNS) which is made up of the brain and the spinal cord, and the peripheral nervous system (PNS) which is the nerves that link the CNS to the skin, muscles, and glands., the neurons that link the CNS to our skin, muscles, and glands.
Free Essay: The central nervous system can be compared to the air traffic control tower of a large international airport. Just as this main tower directs and. Read this essay on Central Nervous System. Come browse our large digital warehouse of free sample essays.
Get the knowledge you need in order to pass your classes and more. Only at ultimedescente.com". - The nervous system is divided into three components: the central nervous system, which encompasses the brain, brain stem, and the spinal cord, the peripheral nervous system, which includes the sensory receptors and effector muscles and organs in the body, and the autonomic nervous system which is part of both the peripheral and central.Download