1. The Nervous System

2. http://www.brainpop.com/health/nervoussystem/nervo ussystem/

3. The basic component of the nervous system is a neuron. zNeuron-conducting cells that constitute the brain, spinal column, and nerves, consisting of a nucleated cell body with one or more dendrites and a single axon. Also called nerve cell.

4. zNeurons have 3 basic parts to them Cell Body [soma] Axon Dendrites

6. zhttp://www.brainpop.com/health/nervoussyste m/neurons/

7. The nervous system has two basic functions. zIt gathers information zIt interprets information

8. This information comes from inside the body and from the world outside the body. The nervous system responds to this information as needed.

9. zThe way your body interacts with the world is through : zStimulus zResponse

10. zStimulus-something that excites or causes a physical response in an organism.

11. zResponse-A reaction to a specific stimulus.

12. The Brain

13. http://www.brainpop.com/heal th/nervoussystem/brain/

14. The Brain The nervous system has two parts. zCentral nervous system zPeripheral nervous system

15. The Central Nervous System zCentral or CNS- Consists of the brain and spinal cord Spinal Cord Brain

16. zPeripheral- nerves connecting CNS to muscles and organs Central Nervous System Peripheral Nervous System

17. zThe CNS processes and responds to all of the messages coming form the peripheral nervous system. Normally, information is transferred from the PNS to the CNS and Back. However, in some cases the PNS causes a response without involving the CNS.

18. PNS The PNS has two types of nerves: Somatic and Autonomic nerves. zSomatic-control conscious movement. zAutonomic-control involuntary movements.

19. Autonomic System zTwo divisions: ysympathetic yParasympatheitic zControl involuntary functions yheartbeat yblood pressure yrespiration yperspiration ydigestion zCan be influenced by thought and emotion

20. The brain can be divided into 3 regions zmedulla zCerebellum zCerebrum

21. zCerebrum -is the thinking part of the brain and it controls your voluntary muscles.

22. zCerebellum -It controls balance, movement, and coordination (how your muscles work together).

23. zMedulla -is to control your involuntary muscles the ones that work automatically, without you even thinking about it, also sorts through the millions of messages that the brain and the rest of the body send back and forth.

26. Peripheral Nervous System z2 kinds of neurons connect CNS to the body ysensory ymotor Spinal Cord Brain Nerves

27. zMotor - CNS to muscles and organs: a nerve cell neuron that sends nerve impulses from the spinal cord or brainstem away from the central nervous system toward a muscle or gland zSensory - sends nerve impulses from the sense organs (sensory receptors) to the CNS.

28. Muscle Motor Neuron Interneuron Skin receptors Sensory Neuron Brain

29. The senses provide information about the outside environment to the nervous system. There are five senses: zSight zTouch zHearing zTaste zSmell

30. 5 senses zThe senses of sight, touch and hearing involve processing physical information from the environment. zThe senses of smell and taste involve processing chemical information.

31. 5 senses zLet’s look each one and explore the nerve responsible for helping navigate our world.

32. Optic nerve zOptic nerve- the second pair of cranial nerves whose nerve fibers transmit visual light signals from the eye to the brain.

34. http://www.brainpop.com/heal th/senses/eyes/

35. Auditory nerve zAuditory nerve-nerve connecting inner ear to brain: a nerve that conveys impulses relating to hearing and balance from the inner ear to the brain

37. Olfactory nerve zOlfactory nerve- nerves consisting of sensory fibers that conduct to the brain the impulses from the mucous membranes of the nose.

39. taste zTaste buds-Oval-shaped clusters of cells located on the tongue and lining of the mouth that contain special nerve endings that help give rise to the sense of taste.cells nerve

41. http://www.brainpop.com/heal th/senses/taste/

42. skin zIs made up of different layers. Let’s look at 2 of them. zDermis zEpidermis

43. Dermis zDermis -the dense inner layer of skin beneath the epidermis, composed of connective tissue, blood and lymph vessels, sweat glands, hair follicles, and an elaborate sensory nerve network.

45. Epidermis zEpidermis-the outer layer of the skin covering the exterior body surface of vertebrates.

47. Light to Dark zThere are many different skin tones. From the very light to the very dark. Let’s look at what causes us to have different skin color.

48. Melanin zMelanin-Insoluble naturally occurring dark pigments found in skin, hair, fur, and feathers. Responsible for the color of your skin. zMelanin protects the body by absorbing ultraviolet radiation from the sun.ultraviolet radiationsun

50. zThe End