Anatomy And Physiology

Insights into the Brains Sense of Perception



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The nervous system:

The nervous system works through symbolic interface of the environment. A phenomenon is perceived through an olfactory apparatus; eyes, ears, nose, mouth, and skin; which then is transformed into a response in the cerebrum. The cerebrum tells the rest of the body how to react to the experience. In some cases, where reflexes are concerned, like when your hand touches something hot or sharp, at the point of contact an electrical current flows to your spinal cord which then tells the hand to move away as quickly as possible, the signal then flows back causing the muscles to contract so that time is saved in an attempt to prevent serious injury. The nervous system is complex; it works as efficient as it can, given any task, so that an organism can react in a timely manner to an incident Let us take a look at how the nervous system works through the process of reading the words on this page:

The words on this page are symbols, which pass through your optic sensory receptor to sensory neurons arriving at synapses which cause them to fire sending an electrical current of information. Which is then transported to interneurons, the action potential triggers the release of neurotransmitters at the end of sensory neurons. The neurotransmitters diffuse across synaptic clefts that trigger changes to some of your interneurons (the information triggers certain interneurons so that the current can be understood by the cerebrum) from the midbrain to the thalamus. The thalamus then sorts the data triggered by the interneurons and directs it to the cerebrum which changes the data into an integrated response (i.e.-the meaning of the words on this page); the cerebrum transfers the new information back to the thalamus. The thalamus sends the response in a current to the cerebellum; the current is then directed to the spinal cord. The spinal cord sends the information along the parietal thorax. Dendrites receive the current and convey it to the neuron's cell body, which then transfers the information to the axon pushing the current through the myelin sheath, which transfers sodium and potassium at the Nodes of Ranvier (the transfer of sodium and potassium keep the signal flowing). Ending at synaptic terminals where the information flows to another dendrite continuing the process which takes only moments by the time it reaches your hand resting on the mouse causing your finger muscle to contract to click on the much more point on this page.

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