The somatic nervous system carries information to the

Some common misconceptions about the brain are that older brains canГўВЂВ™t make new cells and that people use only 10 percent of their brain. There are two systems within the peripheral nervous system, the somatic nervous system, and the autonomic nervous system. The peripheral nervous system is all the neurons and nerves that are not part of the brain and spinal cord and that extend throughout the body. Spinal cord reflexes involve afferent neurons, interneurons, and efferent neurons, forming a simple reflex arc. The outer part of the cord transmits messages to and from the brain, whereas the inner part controls lifesaving reflexes such as the pain response. The central nervous system consists of the brain and the spinal cord. Most neurotransmitters are taken back into the synaptic vesicles in a process called reuptake.ДЄCh is cleared out of the synapse by enzymes that break up the molecules.Дў.4ГўВЂВ‚Explain how the brain and spinal cord interact, describe some misconceptions about the brain, and explain neuroplasticity. Serotonin is associated with sleep, mood, and appetite.Дopamine is associated with ParkinsonГўВЂВ™s disease and schizophrenia.Д®ndorphins are neural regulators that control our pain response. GABA is the major inhibitory neurotransmitter high amounts of GABA are released when drinking alcohol. It stimulates muscles, helps in memory formation, and plays a role in arousal and attention. The first known neurotransmitter was acetylcholine (ACh). Neurotransmitters may be either excitatory or inhibitory. The neurotransmitter molecules fit into receptor sites on the next cell, stimulating or inhibiting that cellГўВЂВ™s firing. Synaptic vesicles in the end of the axon terminal release neurotransmitter chemicals into the synapse, or gap, between one cell and the next. It is the speed and number of neurons firing that tell researchers the strength of the stimulus.Дў.3ГўВЂВ‚Describe how neurons use neurotransmitters to communicate with each other and with the body. Neurons fire in an all-or-nothing manner. When stimulated, this reverses the charge by allowing positive sodium ions to enter the cell. When at rest, the neuron is negatively charged on the inside and positively charged on the outside. Myelin also speeds up the neural message.ДЄ neuron contains charged particles called ions. These axons bundle together in ГўВЂВњcablesГўВЂВќ called nerves.

Myelin insulates and protects the axons of neurons that travel in the body. Glial cells separate, support, and insulate neurons, and influence thinking, memory, and other forms of cognition. Neurons have four primary components: dendrites that receive input, a soma or cell body, axons that carry the neural message to other cells, and axon terminals that are the site of neurotransmitter release. The brain is made up of two types of cells, neurons and glial cells. The nervous system is a complex network of cells that carries information to and from all parts of the body. Your computer does not support HTML5 audio Neurons and Nerves: Building the NetworkДў.1ГўВЂВ‚Identify the parts of a neuron and describe the function of each.

The somatic nervous system carries information to the