B. Write the letter of the correct answer on the blank. 1. Why is our nervous system important? A. It absorbs the nutrients needed by our body. B. It removes waste from the body. C. It controls the other systems so that they work properly. 2. It is the primary organ of the central nervous system contained and protected by the skull. A. Brain B. Spinal Cord D. Nerves D. Midbrain 3. It is the largest part of the brain. A. Cerebrum B. Cerebrum C. Spinal Cord D. Nerves 4. Pathway of messages from the nerves to the brain. A. Neuron B. Spinal Cord C. Nerves D. Cerebellum 5. It is responsible for balance, posture, and movement coordination. A. Cerebrum B. Cerebellum C. Medulla Oblongata D. Spinal Cord 6. What organ of the urinary system acts as temporary storage of urine? A. Kidney B. ureter C. urethra D. urinary bladder 7. By what process does the body eliminate waste products from the body? A. Circulation B. digestion C. excretion D. ingestion 8. What will happen to the body when the kidneys stop working? A. The body accumulates poisonous substances in the blood. B. The body becomes healthy and strong. C. The body sweats a lot. D. The body will be dehydrated. 9. What is NOT filtered from the blood by the kidneys? B. excess water C. oxygen A. Excess salt D. urea 10. Urine is finally forced out of the body by the A. Contraction of the smooth muscles of the bladder, B. Peristalsis of the smooth muscles of ureters, C. The pumping of the cardiac muscles of the heart. D. The filtering of the nephrons of the kidney.​