1. ... doesn’t just make you nervous, but...
The Nervous System
... doesn’t just make you nervous, but...

2. ... controls your body and its functions by electricity.

3. The Nervous System also makes you aware of your environment through:
Receptors(sense organs)- sense changes in the environment. (eyes, ears, skin, nose, tongue)

4. Receptors send their messages through:
Conductors- nerves that carry messages in, make decisions, and carry those decisions back out.

5. Conductors cause the response to occur at an:
Effector- an organ such as a muscle or gland that responds.

6. Stimulus/Response of the nervous system allows you to survive your environment.

7. Brain- burns food to create electricity for stimulus/ response

8. The brain is divided into right and left sides.
The sides
of the brain
are the right
and left
hemispheres.
Right
Left
stop

9. The Human Nervous System
is made of cells called...

10. Neurons (nerve cells) which bundle together to form...
... Nerves

11. Neurons
Dendrites
Synapse
Axon
Direction of
Nerve Impulse
100 m./ sec.

12. Divisions of Nerv. Syst.
Voluntary- you are aware and can control. ex. thinking, common muscle movements
Involuntary- you are unaware and cannot control. (automatic) ex. heartbeat, digesting, breathing

13. Divisions of Nerv. Syst.
Central- brain and spinal cord; protected by bone and fluid
Peripheral- sensory(in) and motor(out) nerves connecting the central nervous system to the environment. bare nerves

14. Central
Peripheral

15. Peripheral Nerv. Syst.
Sensory nerves- receives stimulation from the sense organs and carry message to the C.N.S.(Central Nervous System)
Motor nerves- send messages from the C.N.S. to action organs(muscles and glands)

16. Central Nervous System
Spinal Cord- relay center between brain and Peripheral Nervous System. Also makes simple decisions(reflexes)

17. Central Nervous Syst.(cont.)
Brain
Medulla- involuntary; breathing, heartbeat, etc.
Inside of brain

18. Cerebellum- involuntary; coordinates muscle movements

19. Cerebrum- voluntary; thinking, movement, senses, memory

20. The cerebrum is divided into right and left hemispheres.
The right hemisphere controls the left side of your body, and the left ...
Right
Left

21. The two hemispheres are connected by a band of nerves so that each “brain” is aware of the other.

22. Gray matter (cortex) is where memory is stored and thinking is done.
The outer part of the cerebrum is called gray matter or the cerebral cortex.
Gray matter
(cortex) is where memory is stored and thinking is done.

23. The inner portion is called white matter.
White matter relays and coordinates messages from different regions of the gray matter.

24. You are your nervous system
You are your nervous system. Your personality, behaviors, and emotions originate from your brain.

25. The Endocrine System
... works with the nervous system to regulate and control your body. Uses chemicals called hormones instead of electricity.

26. These hormones enter the bloodstream and are produced by
Glands.

27. ... the hormone only works on certain target organs.
The gland secretes it’s hormone to the entire circulatory system, but ...
... the hormone only works on certain target organs.

28. Endocrine Glands
Pituitary Gland- “master gland”. Controls many other glands Also regulates growth and urine output.

29. Parathyroids- controls the amount of calcium in blood.
Thyroid- controls how fast or slow you burn up food and oxygen. Metabolism
Parathyroids controls the amount of calcium in blood.
Thyroid

30. Adrenal Glands- controls salt balance in blood
Adrenal Glands- controls salt balance in blood. Also prepares body in emergency by releasing adrenaline and cortisone. Releases some sex hormones.

31. Pancreas- produces insulin, hormone which allows glucose to be absorbed from blood into cells. Also converts excess glucose to fat or glycogen (stored starch in liver).

32. Ovaries or
Testes-
produce sex hormones which control sex characteristics as well as regulate egg and sperm production.

33. Together...
... the nervous and endocrine systems keep your body functioning in response to the environment.