1. The Human Nervous System

2. Major Functions
Sensory input – sensory or afferent neutron detect internal or external changes ( stimuli ) and send the message to the brain or spinal cord.
Integration – interneurons in the brain or spinal cord process and interpret the message from the sensory neurons, and relay the message back to body parts. (Response to Stimuli)
Motor output – motor or efferent neurons receive the message from interneuron and produce a response at the effector organ ( a muscle or a gland).

3. Stimulus/ Response Any change inside or outside the body
The nervous system helps respond to stimuli
- Internal stimuli: Thirst, pain, tired
External ???

4. Neurons
Nerve cells, Basic working unit of the brain, Basic structure of the nervous system.
Specialized cell designed to transmit information to other cells (nerve, Muscle. Etc)
Made up of cell body, axon, dendrite.
30,000 neurons can fit on a pin-head

5. Parts of a Neuron
Cell Body: largest part that controls activities of the cell
Dendrites: thread-like structures that carry messages to the cell body(Antenna)
Axon: tail-like structure that carries messages away from the cell body (cable)
Neurons do not touch, they are separated by a gap called a synapse
Messages jump across the gap on neurotransmitters.

6. Types of Neurons
Sensory Neurons: sense changes and carry the message to your brain and spinal cord (5 Senses)
Interneurons: translate the message and connect sensory to motor neurons (Middle Man)
Motor Neurons: receive messages from the brain and make movements

7. Travel Through the Nervous System Nerve Impulse
a signal transmitted along a nerve fiber, The path of a message in the nervous system
In the form of electrical and chemical signals
There are tiny gaps between neurons called synapses
Nerve impulses have to jump over the gaps.

9. Parts of the Nervous System 1. Central Nervous System (CSN)
The complex of nerve tissues that controls the activities of the body.
CNS is composed of the brain (located in the cranial cavity) and the spinal cord (located in the vertebral cavity).
They serve as the main control centers for all body activities.

10. The Brain Main control center 3 main parts
Cerebrum: largest part that controls voluntary activities, thought, language, senses and memory.
Cerebellum: coordinates muscle action and maintains balance, posture.
Medulla::(Brain Stem) connects brain to the spinal cord and controls involuntary actions (Breathing, Heartbeat, Blood Pressure)

12. Which of the following letters does not belong?
A H I M N O T U V W

13. Spinal Cord Protected by the vertebrae
Connects the brain to the rest of the nervous system
Makes reflexes possible: responses to stimuli
Impulses can travel as fast as 268 mph

14. 2. Peripheral Nervous System
network of nerves branching out from the brain and spinal cord
Link between the central nervous system and the rest of the body
Nerves that extend from the spinal cord and brain to the rest of the body
Sensory Nerves: Body to brain
Motor nerves: brain to body.