15. What happens to your diaphragm when we exhale? a. It relaxes and straightens c. It relaxes and become dome-shaped b. It contracts and straightens d. none of the above 16. Also known as throat, is the passageway of food, water, and air. a. Pharynx b. alveoli C. Cilia d. mucus 17. What do you call the epiglottis that contains two vocalchords. a. larynx or voice box c. throat b. nasal cavity d. trachea 18. It is made up of muscles and elastic fibers with rings of cartilage and it also filters the air we breathe. a. pharynx b. alveoli C. Cilia d. trachea or windpipe 19. It has two tubes that carry air into the lungs. a. Bronchi b. nasal cavity c. pharynx d. alveoli 20. What do you call the graped-like structures at the end of bronchioles. a. Bronchi b. nasal cavity c. pharynx d. alveoli 21. It consists of dendrites, axon, and cell body. a. brain b. neurons C. spinal cord d. all of the above 22. It is the master organ of the nervous system and control center of the body. a. brain b. nerves C. spinal cord d. neurons 23. It is the transmitter of messages from different parts of the body to the brain and vice versa. a. brain b. nerve cells C. spinal cord d. lungs 24. A system composed of brain, neurons or nerve cells, and spinal cord. a. digestive system c. respiratory system b.nervous system d. circulatory system 25. Without the nervous system you could not __ a. breathe b. walk c. both a and b d. all of the above 26. What are the three parts of the Nervous System? a. brain, arteries, nerves c. brain, spinal cord, nerve cells b. spinal cord, brain, cells d. all of the above 27. It is the largest part of the brain and the center of emotion a. cerebrum b. cerebellum c. brain stem d. hypothalamus 28. What protects the spinal cord? a. ribs cage b. skull C. spinal column d. neurons 29. These are small nerve fibers that bring messages towards the cell body. a. Axon b. cell body c. dendrites d. Spinal cord 30. It contains the nucleus and nerve fibers. a. axon b. cell body c. dendrites d. Spinal cord
