2 What does it do? Is the communication and control system of the body. Receives information.Responds to information.stimulusresponseMaintains homeostasis.
3 Parts of the Nervous System Central Nervous System (CNS)Brain - main control of the body - directs and coordinates all body processes, thoughts, behaviors and emotionsSpinal Cord - bundle of nerves inside the vertebra that carries messages to and from the brain.Peripheral Nervous System (PNS)all other nerves in the bodyAutonomic Nervous SystemControls the body’s automatic function
4 What’s a neuron? A message carrying cell. Carries messages to and from the brain and spinal cord.Parts of a neuron:Dendrites- receive impulses from other neurons and send them to the cell body.Axons- carry impulses away from the cell body.Synapse- small space between two neurons.2
6 Kinds of neuronsSensory Neurons - pick up stimulus from internal or external environment and converts into a nerve impulse.Interneuron - carries nerve impulses from one neuron to anotherMotor neuron - sends an impulse to a muscle
7 What’s a nerve impulse? The message that a neuron carries. It is the signal that is passing through a neuron.
8 What’s a reflex? Responses to changes in the environment. AutomaticFastHelp maintain homeostasis.Allow rapid response to changes.Involve spinal cord and nerves.