31. Which of the following is NOT part of the intrinsic conduction system of the heart?        

37. Which of the following is NOT a function of the kidneys?

30. By 72 hours after fertilization, the egg has divided into more than 160 cells and is called the morula.

45. Prior to the let-down reflex, the mammary glands secrete a yellowish fluid called ________ that has less lactose than milk and almost no fat.        

23. How is most carbon dioxide transported within the blood?

20. If a woman has just ended her menstrual phase, when is she most likely to ovulate?        

33. Which of the following is NOT a function of the large intestines?

50. As pregnancy continues, the increasing bulkiness of the anterior abdomen changes the woman’s center of gravity, possibly causing an accentuated lumbar curvature called ________.        

48. If the AV node is not working correctly, a surgeon should surgically implant the heart with an artificial pacemaker.

44. Auricles are the flaplike appendages attached to the atria that provides a reserve capacity to increase the atrial volume. The atria are receiving chambers for blood returning to the heart from the pulmonary and systemic circulation.