Analyze the function of the nervous system.

1. Analyze the function of the nervous system. 1H11.02

2. Neuron Function • It is the neurons job to pass or “transmit” messages from one cell to the next cell.

3. SYNAPSE • There is a space between each neuron called the synapse.

4. How does a nerve impulse start? • A stimulus creates the impulse. • The impulse travels into the neuron on the dendrite and it comes out on the axon. At the end of the axon, a neurotransmitter is released that carries the impulse across the synapse- to the next dendrite.

5. Three types of nervous tissue.

6. Sensory Neurons • Also called afferent neurons • Carry impulses from the skin and sense organs to the spinal cord and brain.

7. Motor Neurons • Also called efferent • Carry messages from the brain and spinal cord to muscles and glands.

8. Associative Neurons • Also called interneurons • They carry impulses from sensory neurons to motor neurons.

9. Three kinds of Nervous Systems

10. The Central Nervous System • Containsthe brain and the spinal cord.

11. What surrounds the spinal cord? • Spinal Fluid!!! • Spinal fluid • Spinal fluid • What is the function of CSF? Spinal fluid Spinal fluid Spinal fluid

12. Peripheral Nervous System • Made up of the cranial and spinal nerves. spinal cranial cranial spinal

13. Autonomic Nervous System Made up of two sub systems • Sympathetic system • Parasympathetic system

14. Sympathetic System • AKA = SNS • “Fight or Flight” • When the body perceives danger, the SNS sends a message to the adrenal medulla to secrete adrenaline- this increases your heartbeat.

15. Parasympathetic System • Counter acts the SNS. • Decreases the heart rate.

16. REFLEXES • Unconscious and involuntary • One example is the knee jerk response. • Involves a sensory nerve and a motor nerve.

17. Reflexes are used to protect the body automatically. They quickly move us away from things that may hurt us.

18. READY, SET, GO= Start studying.