2a Nervous System functioning

• The neuron is a nerve cell that receives and transmits neural information
• The Human Nervous system is made up of billions of neurons, including three main types: Sensory Neurons (Afferent), Motor Neurons (Efferent), and Interneurons found only in the Brain and Spinal cord
• Neurons do not travel; they form Neural Pathways, a series of connected neurons that send signals from one part of the Nervous System to another
• The Central Nervous System consists of the Brain and the Spinal Cord, while the Peripheral Nervous System consists of the Somatic Nervous System (voluntary) and the Autonomic Nervous System (involuntary)
• The Autonomic Nervous System is subdivided into the Sympathetic Nervous System (action/stress) and the Parasympathetic Nervous System (calm/relaxation)
• The Sympathetic Nervous System dominates in threatening situations, increasing arousal and preparing the body for a quick response, known as the Fight-Flight-Freeze Response