The document describes the structure and function of neurons and the nervous system. It discusses the main parts of a neuron including dendrites, soma, nucleus, myelin sheath and axon. It also describes the three main types of neurons and explains how networks of neurons communicate via the central and peripheral nervous systems. The central nervous system comprises the brain and spinal cord, while the peripheral nervous system includes the somatic and autonomic nervous systems. The document concludes by outlining how different drugs can disrupt signaling in the nervous system.

1. The Nervous
System

2. The Neuron:
Parts:
a. Dendrites – receives info from other cells

3. The Neuron:
Parts:
a. Dendrites
b. Soma (cell body) – processes the signal/disturbance
and spreads to the trigger zone

4. The Neuron:
Parts:
a. Dendrites
b. Soma (cell body)
c. Nucleus – contains the DNA

5. The Neuron:
Parts:
a. Dendrites
b. Soma (cell body)
c. Nucleus
d. Myelin Sheath – transmits info efficiently and quickly

6. The Neuron:
Parts:
a. Dendrites
b. Soma (cell body)
c. Nucleus
d. Myelin Sheath
e. Axon – transmits messages to another cell

7. Types of Neuron:

8. Types of Neuron:
1. Sensory Neuron – obtains signals from outside the body

9. Types of Neuron:
2. Interneuron – connects neuron to neuron

10. Types of Neuron:
3. Motor Neuron – carry and transmit signals to
muscles, glands and skin

11. Network of Neurons:

12. NERVOUS SYSTEM
CENTRAL NERVOUS SYSTEM PERIPHERAL NERVOUS SYSTEM
BRAIN SPINAL CORD MOTOR NEURONS SENSORY NEURONS
AUTONOMIC NERVOUS SYSTEM SOMATIC NERVOUS SYSTEM
SYMPATHETIC PARASYMPATHETIC

13. The Central Nervous System:
1. Brain – processes all the information received and
determines what to do with it

14. The Central Nervous System:
1. Brain – processes all the information received and
determines what to do with it

15. The Central Nervous System:
1. Brain
2. Spinal Cord – information highway

16. The Peripheral Nervous System:
1. Somatic Nervous System –
receives messages from the
CNS to the skeletal muscles;
normally under voluntary
control

17. The Peripheral Nervous System:
1. Somatic Nervous System
2. Autonomic Nervous System – concerned with signals
to and from internal organs and glands
a. Sympathetic – stress, excitement and danger
b. Parasympathetic – relaxed mode

18. Drugs disrupt signaling:
1. Stimulants – block brain receptors that suppress brain
cell activity

19. Drugs disrupt signaling:
1. Stimulants
2. Depressants – stimulates the release of endorphins
causing euphoria then depression

20. Drugs disrupt signaling:
1. Stimulants
2. Depressants
3. Analgesics – blocks the transmission of signals
carrying pain messages

21. Drugs disrupt signaling:
1. Stimulants
2. Depressants
3. Analgesics
4. Hallucinogens – destroy sensory perceptions and
bring on dreamlike state