Pg.+96-97

1. Your brain and spinal cord make up your ** __central nervous system__. ** 2. Sensory receptors in the ** __eardrum__  ** detect vibrations. 3. Epinephrine is produced by the adrenal glands in responses to ** __stress__. ** 4. The part of a neuron that passes an impulse to other cells is the ** __dendrite__. ** 5. The medulla is mostly responsible for activities that are ** __involuntary__. ** 6. Receptors that can convert light into impulses are found in the ** __olfactory cells__. **

7. c. olfactory cells 8. a. iris 9. c. thyroid 10. d. motor neutrons 11. d. medulla 12. b. salivary gland 13. Several situations in which your adrenal glands might release epinephrine, causing you to have a right-or-flight reaction, are when you're in your home alone while it's storming late at night and you hear a knock at the door, if you could swear someone is following you down a dark alleyway, if you have to go into the dark basement alone, or if you're walking down the street and you suddenly feel someone's warm breath on your neck. 14. The thing that causes the size of your pupils to change is when visible light is reflected by objects around you, and enters through the opening at the front of your eyes, which is called the pupil. The amount of light that is reflected around you will change the size of your pupil as well. 15. A quick involuntary movement is called a reflex. A reflex enables you to react quickly because, say, when you bang your knee into a sharp corner, a message that would be translated into “pain” would travel to your spinal cord. Then, a message to move your knee would travel back to the muscle in your leg, and since the muscles in your leg respond before the information ever reaches the brain, you wouldn't even thin about it before moving away. 16. The function of the middle ear is to cause the eardrum to vibrate when sound waves reach the outer ear. 19. It is important to have a lens that can change shape inside the eye because the lens needs to focus on the light just in front of the retina and not everything else around. It would generally depend on what you are looking at and how far away that particular thing is. 21. It is important that reflexes occur without thought because if they didn't, we'd have to stand the pain a lot longer than we would when our reflexes helped because it would have to be a moment before our brain really processed that what was occurring was pain. 24. The letter that identifies the gland that regulates blood sugar is ** e. ** 25. The letter that identifies the gland that releases a hormone that stimulates the birth process in pregnant women is ** f. ** 26. The letter that identifies the glnad that helps the body fight disease is ** c. **