3. Which of the following is true about the structure of the kidneys? a.heart- shape, 3 to 4 inches long and 2 to 5 inches wide b. oblong, 1 to 2 inches long and 2 to 3 inches wide c. bean, 4 to 5 inches long and 2 to 3 inches wide d. round- shape, 4 to 5 inches long and 2 to 3 inches wide 4. Why is the right kidney slightly lower than the left? a.The right kidney is bigger than the left b. The right kidney is heavier than the left c. The stomach pushes the right kidney down d. Due to the presence of liver on the right region of the body 5. Which of the following is a function of the kidney? a. They produce blood. b.They store salt in the blood. c.They add urea to the blood. d.They filter metabolic wastes produced by the body. 6. Kidneys are the major part of what body system? a.digestive system c. urinary system b.circulatory system d. nervous system MOT n functinn of the kidney?​