| A | B |
|---|
| NEURONS | CARRY MESSAGES IN ONLY ONE DIRECTION- THREE TYPES OF NEURONS |
| SENSORY NEURONS | CARRIES MESSAGES FROM THE SENSE ORGANS TO THE BRAIN AND SPINAL CORD |
| MOTOR NEURONS | CARRIES MESSAGES FROM THE BRAIN AND THE SPINAL CORD TO THE MUSCLES OR TO A GLAND |
| ASSOCIATION NEURONS | ARE FOUND WITHIN THE BRAIN AND THE SPINAL CORD- CONNECT THE SENSORY NUERONS TO THE MOTOR NEURONS |
| "REFLEX" | TO TURN BACK-EX.KNEE JERK |
| REFLEX ARC | ROUND TRIP- INVOLUNTARY |
| REFLEXES | ARE PROTECTIVE MECHANISMS: EX- BLINKING, COUGHING, SNEEZING |
| CELL BODY | THE CONTROL CENTER OF THE CELL |
| DENDRITES | THE FIBERS WHICH BRING MESSAGES TO THE CELL BODY |
| AXON | CARRIES MESSAGES AWAY FROM THE CELL BODY |
