1. Nervous System

2. nervous system
the body system that controls and coordinates the body’s functions and its responses to stimuli

3. stimuli/stimulus
anything in the internal or external environment that causes a response

4. neurons
nerve cells

5. dendrites
the part of the neuron that carries impulses toward the cell body

6. axon
the part of the neuron that carries impulses away from the cell body

7. impulse
an electrical signal that a neuron carries
impulse

8. sensory neuron
a neuron that picks up stimuli from the environment and sends a nerve impulse toward the brain
SENSORY SENSES STIMULI

9. interneurons
neurons found in the brain and spinal cord that carry impulses in between sensory and motor neurons
IN BETWEEN

10. motor neuron
a neuron that carries an impulse to muscles telling them to contract or relax
MOTOR MOVES MUSCLES

12. synapse
the small space between neurons through which an impulse crosses
impulse

13. central nervous system
the brain and the spinal cord

14. peripheral nervous system
the nerves that branch out from the central nervous system

15. spinal cord
a bundle of nerves that links the peripheral nerves and the brain

16. spine and vertebrae

17. brain
the organ that controls most of the body’s activities; the main organ of the nervous system

18. `

19. reflex
an automatic response that occurs without conscious control

21. neurons
stimulus
path of a reflex (response to touching something hot):
a. your fingers touch the hot item
b. sensory ________________ in your fingertips detect a _______________

22. spinal cord an impulse muscles
c. they send ________________ through your hand and arm to your __________________ ___________
d. your spinal cord sends an immediate response to your arm ______________

23. impulse from the interneurons in the SC
motor
impulse from the interneurons in the SC
e. the __________________ causes you to quickly pull your hand away from the heat by stimulating the ______________ neurons in your arm and hand

24. pain
brain
f. other nerve impulses travel to from your spinal cord to your _____________ which sends a signal that tells your hand it feels __________________