1. The Nervous system

3. THE NERVOUS SYSTEM
BRAIN
SPINAL CORD
NERVES
SENSE ORGANS

4. FUNCTIONS of THE NERVOUS SYSTEM
1. RECEIVING INFORMATION
you are aware of what is happening both inside and outside the body
2. RESPONDING TO INFORMATION
STIMULUS – any change or signal in the environment that can make and organism react
RESPONSE – what the body does in reaction to a stimuls
3. MAINTAINING HOMEOSTASIS
Directs the body to respond appropriately to the information it receives

5. DIVISIONS OF THE NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM
All information about what is happening in the world inside and/or outside the body is brought to Central Nervous System
Control Center of the Body
Consists of the BRAIN and SPINAL CORD

6. DIVISIONS OF THE NERVOUS SYSTEM: CENTRAL NERVOUS SYSTEM
3 MAIN REGIONS OF BRAIN
1. CEREBRUM
Interprets input from the senses
Controls movement
Carries out complex mental processes
2. Cerebellum
Coordinates the actions of your muscles
Helps maintain balance
3. BRAIN STEM
Controls the body’s involuntary actions
BRAIN
Controls most functions in body
Contains approx. 100 Billion Neurons

7. DIVISIONS OF THE NERVOUS SYSTEM: THE CENTRAL NERVOUS SYSTEM
SPINAL CORD
The link between the brain and the peripheral nervous system

8. DIVISIONS OF THE NERVOUS SYSTEM
PERIPHERAL NERVOUS SYSTEM
Consists of a network of nerves that branch out from the Central Nervous System and connect it to the rest of the body
Involved in both Involuntary and Voluntary Actions
Total of 43 pairs of nerves

9. DIVISIONS OF THE NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM
DIVIDED INTO 2 GROUPS
1. Somatic Nervous System
Controls voluntary actions
2. Autonomic Nervous System
Controls Involuntary Actions
DIVIDED INTO 2 GROUPS
1. Somatic Nervous System
Controls voluntary actions
2. Autonomic Nervous System
Controls Involuntary Actions

10. THE NERVOUS SYSTEM REFLEXES SIGNALING THE BRAIN
An automatic response that occurs very rapidly and without conscious control
SIGNALING THE BRAIN
Nerve impulses reach brain and are interpreted
Takes longer for the pain impulse to reach brain and be interpreted then it does for the reflex action to occur

11. The Nervous System NERVOUS SYSTEM INJURIES Concussion
A bruiselike injury of the brain
Spinal Cord Injuries
Occur when spinal cord is cut or crushed

12. THE NERVOUS SYSTEM NEURONS Cells that carry information
throughout the nervous
system

14. THE NERVOUS SYSTEM NEURONS
3 Kinds of Neurons
1. Sensory Neurons
Picks up stimuli from internal or external environment and converts into a nerve impulse
2. Interneuron
Carry nerve impulses from one neuron to another
3. Motor Neurons
Sends nerve impulses to a muscle of gland and the muscle or gland reacts in response

15. THE NERVOUS SYSTEM NERVE IMPULSE SYNAPSE Message that a neuron carries
Begin in Dendrite, Move toward the cell body, then move down the Axon
SYNAPSE
Junction where one neuron can transfer an impulse to another