Need an argumentative essay on The Role of the Nervous System and Reflex Arcs in the Body. Needs to be 4 pages. Please no plagiarism.Download file to see previous pages... Therefore, conduction of ner

Need an argumentative essay on The Role of the Nervous System and Reflex Arcs in the Body. Needs to be 4 pages. Please no plagiarism.

Therefore, conduction of nerve impulses along nerve fibers forms an important part in controlling functions and body activities. The path taken by nerve impulses to generate a reflex is known as a reflex arc. In humans, several reflex arcs may make up one reflex action. The reflex arc depicts the simplest route taken by a single nerve impulse to generate response.” One of the most fundamental properties of the spinal reflex is that of reciprocal innervations first described by Sherrington. Where one set of muscles in a reflex act is activated, the activity of a set of antagonistic muscles is reciprocally depressed” (Brown, 1914). The components of the impulse circuits consists of – receptors, afferent nerves, brain or spinal cord, Efferent nerves and effectors. The stimulus is first received by the receptor tissue, organ or cell. The receptor conducts the stimulus impulse to the efferent (sensory) nerves. The sensory nerves transmit the stimulus to the CNS which generates the appropriate response. Interneurons are present with the CNS to transmit the impulse from the sensory to the motor nerve, thereby creating a continuous neural network. This response is transmitted by the motor nerves or efferent nerves to the effector muscle, gland or organ which finally responds to the applied stimulus. The most important part of this entire circuit is the conduction of the impulses along the neurons. We may notice that excluding the receptors or the effectors, the transmission of the impulse is done by nerve fibers which make them the most crucial components in controlling the body systems. Neurons consisting of dendrites and axons are linked to one another by a synapse forming a nerve fiber. Calcium channels open when the impulse depolarizes the presynaptic membrane. The ions help in the release of neurotransmitters like acetylcholine, GABA etc. into the synaptic cleft. With the help of these neurotransmitter chemicals the impulses travel from one neuron to the next and along the entire neural path. Depolarization of the cell membrane excites the cell and initiates nerve impulse. After the impulse crosses over the cleft, the neurotransmitters involved are removed with the help of enzyme action and re-absorbed and re-cycled for transmission of the next nerve impulse. Reflexes induced by nerve impulse conduction, help us to maintain balance and posture. It also assists in movement of the body. 2) Reflexes help us respond immediately to harmful stimuli and also relieve the brain from too much of work. Therefore, we can understand the importance of impulse transmission in the body. The role played by the nervous system in the body is of extreme importance because it helps to maintain a steady state. The autonomic nervous system which controls all the involuntary actions of the body is a vital system because without this system maintenance of homeostasis in the body would have been impossible. For example, if we touched a hot iron and we had no reflex to remove our hands, the skin would be burnt and we would have an injury. To understand the role of nervous system in the body we must understand biological process like “those involving the functioning of the central nervous system, which behaves as self-regulatory devices or servo- mechanisms.