2 Important Vocabulary Neuron Central nervous system Dendrite Peripheral nervous systemAxonCerebrumSensory neuronCerebellumInterneuronBrain stemmotor neuronreflecSynapse
3 EXPLORE ACTIVITY pg. 677What did you find out about their heights? How were your eyes tricked?
4 Response to StimuliAny change inside or outside your body that brings a response is called a stimulusStimuliOur bodies have internal control systems that maintain homeostasisBreathing, heartbeat,digestion
5 Neurons Neuron: the working unit of the nervous system A neuron is made up of a cell body and branches called dendritesDendrites receive messages and send them to the cell bodyAn axon carries messages away from the cell bodyMessages carried by a neuron is called an impulse
6 Types of NeuronsSensory: receive information and send impulses to the brain or spinal cordInterneurons: relay impulses from the sensory to motor neurons. There are more of interneurons than any other typeMotor: conduct impulses from the brain or spinal cord to muscles or glands throughout your body.
8 SynapseSince neurons don’t touch each other, how does an impulse move from one another?Synapse: small space where an impulse moves from one neuron to another.When impulse reaches the end of the axon, a nerve transmitting chemical is released by the axonThis chemical diffuses across the synapse and starts an impulse in the dendrite or cell body of the next neuron
10 Central Nervous System Made up of theBrainSpinal cordAll body activities are coordinatedIf steps on your foot, your whole body reacts
11 The Brain Made up of 100 billion neurons Divided into 3 parts Cerebrum CerebellumStemCerebrum:divided into two large sections called hemispheresImpulses from the senses are interpretted,Memory is storedVoluntary muscle control center
12 The Brain Cerebellum Behind and under the cerebrum Coordinates voluntary muscle movementMaintains balance and muscle toneStemExtends from the cerebrum and connects the brain to the spinal cordParts: midbrain, pons, medullaControls heartbeat, breathing, blood pressure
13 Peripheral Nervous System Brain and spinal cord are connected to the rest of your body by the peripheral nervous systemMade up of 12 pairs of cranial nerves from your brain31 pairs of spinal nerves from your spinal cordThese nerves link your CNS with all parts of your bodySpinal Nerves: made up of bundles of sensory and motor neuronsSomatic System and autonomic system
14 Somatic and Autonomic System Somatic: consists of the cranial and spinal nerves that go from the CNS to your skeletal musclesConnect the central nervous system to the organs, muscles, and skinIt is like a passageway from the environment to the central nervous systemprocessing sensory information that arrives via external stimuli including hearing, touch and sightAutonomic: controls heartbeat rate, breathing, digestions and gland functionsWhen salivary glands release saliva