QUESTION:

FIGURE OUT WHICH OF THE FOLLOWING SENDS A MESSAGE TO THE BRAIN THROUGH A CHEMICAL REACTION.

CHOICES:

A. ACTION POTENTIAL

B. NERVE IMPULSE

C. STIMULUS

D. RESPONSE

ANSWER:

A.

EXPLANATION:

ACTION POTENTIAL SENDS A MESSAGE TO THE BRAIN THROUGH A CHEMICAL REACTION.

WHEN A MESSAGE COMES INTO THE BRAIN FROM ANYWHERE IN THE BODY, BRAIN TELLS THE BODY HOW TO REACH FOR EXAMPLE, IF YOU TOUCH A HOT STOVE, THE NERVES IN YOUR SKIN SHOOT A MESSAGE OF PAIN TO YOUR BRAIN. THEN SENDS A MESSAGE BACK TELLING THE MUSCLES IN YOUR HAND TO PULL AWAY.

SENSORY NEURONS RECEIVE IMPULSES AND CARRY THEM FOR THE SENSE ORGAN TO THE SPINAL CORD OR BRAIN. INTERNEURONS CONNECT SENSORY AND MOTOR NEURONS AND INTERPRET THE IMPULSE. MOTOR NEURONS CARRY IMPULSES FROM THE BRAIN AND SPINAL CORD TO MUSCLES OR GLANDS. DRAW AND LABEL THE STRUCTURE OF A TYPICAL NERVE CELL.

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