13. Respiratory control centers are located in the ________.        

3. Female orgasm is required for conception.

43. Systole is contraction of the muscle. Diastole is relaxation of the muscle. 

47. The heart murmur is due to complete closure of the pulmonary valve and regurgitation of pulmonary trunk blood during diastole.

46. Muscle tissue is formed by the ________.        

49. A urine test reveals a positive result for human chorionic gonadotropin (hCG). This indicates ________ was successful.        

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.