Nervous System

• what are 4 factors of the nervous system in relation to homeostasis

  fast, doesn't last long (quick), localised spread, transported through electrical impulses and neurotransmitters
• what are the 2 parts of the nervous system

  the central nervous system and the peripheral nervous system
• what is the central nervous system

  brain and spinal cord
• what is the peripheral nervous system

  the nerves that connect the central nervous system to the rest of the body
• what are nerve cells made of

  neurons
• the axons of nerurons are grouped together to form what

  nerves
• what are axons

  a neuron's long, thin fiber that carries electrical messages to other cells.
• what are dendrites

  the receiving antennae of neurons, collecting signals from others through branching extensions.
• what is myelin

  the fatty insulation around nerve fibers that speeds up electrical signals in your brain.
• what are the three different types of neurons

  sensory neurons, interneurons, motor neurons
• what is a sensory neuron

  they carry the impulse generated by the stimulus to the central nervous system
• what is an interneuron

  they carry the impulse through the central nervous system
• what is a motor neuron 


  they take the impulse to the effectors such as muscles of glands
• what are the 3 main parts of neurons

  Cell body, dendrites, and an axon
• dendrites possess numerous receptors that can receive messages from the other cells
• what happens to the message once it has been received

  is moves as an electrical impulse in one direction from the dendrite, through the cell body and then through an axon
• what is a synapse

  the gap between neurons
• what is the axon terminal 


  the end of axon which transports messages to other cells via neurotransmitters
• what happens when the impulse has reached the axon terminal

  neurotransmitters are transported to the cell membrane and then released into the synapse
• what happens during reflex actions

  once the stimulus is detected by a receptor the message is sent via the sensory neuron to the interneuron in the spinal cord and then the motor neuron to the effector to respond with out conscious
• does the message have to go to the brain during reflex actions

  no
• what is the reflex arc

  the pathway the involves only a few neurons and travels only to and from the spinal cord
• what is the order of reflex actions

  stimulus, receptor, sensory neuron, interneuron in spinal cord, motor neuron, effector, response
• what is the order of electrical and chemical signals

  stimulus, receptor, sensory neuron, interneuron, motor neuron, effector, response
• where is the nucleus in a neuron

  in the cell body
• a group of neurons is called a nerve
• Schwann cell


  are the cells that make up the myelin
• The nervous system serves as the body's communication network, transmitting signals between the brain, spinal cord, and the rest of the body to regulate and coordinate various bodily functions and responses.