The nervous system is a complex interconnected network of nerve cells (neurons) that communicates with other tissues in the body and regulates many bodily functions. It is divided into two main parts: the central nervous, which includes the spinal cord and brain, and the peripheral nervous, which contains the rest of the nerves.
The Nervous System. An Analysis of Functions and Structure.
The nervous system of the body is composed of billions neurons and supporting glial cell that are interconnected in order to form complex integrated electronic circuits, Animals use these neuronal circuits to perceive and respond to external stimuli, and coordinate the activities of all other organ systems.
There are two types neurons in the nervous systems: afferent neuron, which transmits signals from peripheral tissues into the CNS and efferent neuron, which carries impulses from CNS effector cells. Afferent neurons conduct impulses that contain sensory information, describing the tissue’s environment, to the CNS through a process called synaptic transmission.That’s why you need Therapies to Reset Your Whole Body Nervous System to keep it healthy.
During synaptic transmission, an electrochemical wave travels along the axon of the neuron to a synaptic synapse on another cell, triggering the release of chemicals called neurotransmitters from the end of the axon. These chemicals bind the membrane of target cells and trigger biochemical processes within those cells according to the commands from the CNS.
There is a second type of activity that occurs in the nervous system without requiring an external stimulus, and it is called the autonomic response. This is the part of your nervous that controls various aspects of your health, such as your blood pressure, heart rate, and dilated eye pupils.
Involuntary actions are controlled by a group of neurons in the brain called the hypothalamus. It secretes a hormone that influences your temperature control, hunger, thirst, and other things.
The CNS consists primarily of the spine and brain, which is wrapped in a thin membrane and bathed within cerebrospinal lubricant. The spinal cord connects all parts of the human body to the brain.
There are twelve cranial nerves which control sensations such as taste, smell, and sight. The spinal cord has 31 pairs of roots that run between the vertebrae, connecting different parts to the body. The spinal cord carries motor and sensor signals between the brain, muscles and separate circuits for reactions.
Afferent Neurons and Synaptic Transmission
Synapses are the most common way that neurons communicate. They are connections between adjacent membranes containing molecular machinery. These molecules are either receptors or channels. When a synapses is stimulated externally, the ion-channels open and send ions to the cells to conduct the signal. The receptors on synapse then attach to chemical molecule in the target cells, triggering biochemical events within that cell.
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