15. The proximal convoluted tubule is the portion of the nephron that attaches to the collecting duct.

35. ____ are inorganic elements in your diet that are required in small amounts for your body to work properly.

34. Which of the following is NOT found in saliva?        

16. Identify the lymph node.

5. In the kidneys, the countercurrent mechanism involves the interaction between the flow of filtrate through the nephron loop of the juxtamedullary nephrons (the countercurrent multiplier) and the flow of blood through the limbs of adjacent blood vessels (the countercurrent exchanger). This relationship establishes and maintains an osmotic gradient extending from the cortex through the medulla’s depths, allowing the kidneys to dramatically varying urine concentration.

47. Which of these is NOT part of the splanchnic circulation?        

25.  Select the description below that illustrates the difference between a sphincter and a circular muscle.    

44. Nervous control of gastric secretion is provided by ________.        

31. Select the statement that is true concerning primary teeth.        

13. Aldosterone is a hormone that causes the renal tubules to reclaim sodium ions from the filtrate.