Science+page+96-97

Science page 96-97 Numbers 1-16, 19, 21, 24-26

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. If you are walking down the street and you notice that strange men are following you, or if you are in house that is on fire your body will be able to handle more smoke in your body, or if you are rock climbing and you fall 50 feet down and you break your ankle and you are in the middle of no where with no one else around, these are all situations in which your adrenal glands might release epinephrine causing your body to have a fight-or-flight reactions. 14. Visible light that is reflected by objects around you enters through an opening at the front of your eyes is called your pupil. The amount of light is reflected around you will change the size of your pupil. 15. A quick involuntary movement is called a reflex. When you step on a sharp object, the message “pain” travels to your spinal cord, and a message to move your foot travels back to the muscle in your leg. The muscles in your leg respond before the information ever reaches the brain. 16. When sound waves reach the outer ear, they are funneled into the middle ear, where they cause the eardrum to vibrate. The vibrating eardrum makes tiny ear bones vibrate. 19. It is important to have a lens that can change shape inside the eye because depending on what you are looking at and how far away the object it is, the lens will focus on the light just in front of the retina not on everything else around. 21. It is important that reflexes occur without thought because if you are cooking a pot of macaroni and you accidentally place your hand on the flame, you body has an instant reflex to move your hand, but if you would have had to think about it you could have done major damage to your outer skin, and maybe even your inner skin, and would have done damage to your body. 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.**