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Name: ____________________ Date: ___________ Ear, Neuron, Brain, Eye Worksheet Ear: 1. ______Fluid-filled structure lined with tiny hairs cells that change pressure waves into nerve impulses. 2. ______Sends nerve impulses to the brain 3. ______Monitor the position of your body, your equilibrium. 4. ______Site where vibrations enter the ear 5. ______Three small bones that receive the vibrations after the eardrum 6. ______Receives vibrations from the stirrup and changes it to a pressure wave 7. ______Drainage to sinuses 8. ______Thin membrane that picks up the vibrations that enter Per. _______ a. b. c. d. e. f. g. h. Auditory canal Auditory nerve Cochlea Eardrum (tympanum) Eustachian tube Hammer/Anvil/Stirrup Oval window Semicircular canals 9. Trace the path that sounds takes through the ear: _______________ __________ ___________ _______________ ____________ _____________ _____________ ____________ brain Neuron: #10-24 There are 3 types of neurons, they are _______________, ______________, & _______________. The ______________ neuron carries impulses from the brain to muscles or glands. The _________________ neuron connects the other two types together. Lastly, the ____________ neuron carries impulses from sense organs to the brain. The electrical signal of the neuron is carried toward the ________________ by the _____________ and away from the nucleus of the neuron by the _______________, which is surrounded by a fatty material known as the ___________________, and individual cells of this material are called ____________ cells. The purpose of this is to help the impulse travel ______________ (speed). There is a space (gap) in between two neurons called the _____________, chemicals called _______________ are released to carry the ______________ across the gap. The Brain: ______25. Control center for recognition and analysis of hunger, thirst, fatigue, anger, body temp. ______26. Main communication link between brain and rest of body. ______27. 31 pairs of nerves that branch off the spinal cord. ______28. Coordinates and balances actions of muscles so body can gracefully and efficiently. ______29. neural “switchboard” –regulates flow of info. between brain and rest of body. ______30. Responsible for voluntary (conscious) activities of body, site of intelligence, learning and judgment. ______31. controls heart rate, breathing, swallowing…etc ______32. Receives messages from all sensory receptors throughout body, relays info. to proper region of cerebrum for further processing. ______33. Connects brain and spinal cord (just below cerebellum). ______34. Consists of the brain and spinal cord. a. b. c. d. e. f. g. h. i. j. Brain Stem Central NS Cerebellum Cerebrum Hypothalamus Medulla Peripheral NS Pons Spinal Cord Thalamus Eye: ______35. Muscle that regulates the amount of light entering the eye ______36. carries the impulse from eye to the brain ______37. the “white” of the eye; continuation of the cornea ______38. Contains the blood vessels that provide O2 and nutrients to the eye ______39. Solid structure that completes the focusing of the light ray ______40. Layer of nerve tissue that translates light energy to nerve impulse ______41. Hole in the iris through which light passes ______42. Gel-like substance that maintains the shape of eyeball; holds retinal tissue in place ______43. Outer transparent covering of the eye; begins the focusing of the light ray ______44. Water-fluid that fills chamber between cornea and lens a. b. c. d. e. f. g. h. i. j. aqueous humor choroid cornea iris lens optic nerve pupil retina sclera vitreous humor 45. Path of light through the eye: _______________ ___________________ ___________ ___________ ____________________ Nervous system Divided into two main branches _______________________ Consists of _______________________ consist of Brain & 31 pairs of _________ off the ___________________ _________________ Further divided into the ________________ (involuntary) Further divided into _________________ Increases __________ ____________ ____________________ Decreases _____________ ______________ ____________ (voluntary) also involves a ___________ Be able to label the Brain, Neuron, Eye & Ear for your TEST