1. Unit 5
Nervous System

2. Major Functions
1. Sensory input- monitors changes that are happening inside and outside the body. Changes are called stimuli.

3. Major Functions
2. Integration- interprets and processes sensory input and makes decisions about what should be done at each moment.

4. Major Functions
3. Motor output- nervous system effects a response by activating muscles or glands.

5. Organization of the nervous system
Structural classification
Functional classification

6. Structural classification Central Nervous System
Brain and spinal cord

8. Structural Classification Peripheral Nervous System
Sensory neurons running from stimulus receptors that inform the CNS of the stimuli
Motor neurons running from the CNS to the muscles and glands - called effectors - that take action.

10. Functional Classification
Deals with only PNS…
Afferent (sensory) division- nerve fibers that convey impulses to the CNS. CNS is constantly informed of events going on inside and outside the body.
Efferent (motor)- Carries impulses from the CNS to effector organs, muscles and glands. These impulses activate muscles and glands. A motor response.

12. Motor Division has two subdivisions
Somatic nervous system- Voluntary control
Autonomic nervous system- involuntary control

13. Autonomic has 2 subdivisions
Sympathetic and Parasympathetic nervous systems.
Sympathetic - “fight or flight” (exercise, excitement, embarrassment)
Parasympathetic – “resting and digesting” (digestion, defecation, diuresis/urination)