Human Biology

1. The alimentary tube is around _____ meters long. A. 2 B. 4 C. 6 D. 9 2. The processes of chewing are referred to as ______ A. churning B. mastication C. peristalsis D. deglutition 3. How many teeth does an average adult have? A. 20 B. 32 C. 30 D. 52 4. The term wisdom tooth refers to the _____ tooth. A. incisor B. third molar C. second bicuspid D. first cuspid 5. The portion of the tooth which lies within the mandible socket is called the A. dentin B. crown C. root D. cementum 6. Which part of a tooth most closely resembles bone tissue? A. enamel B. cementum C. dentin D. gingiva 7. A hiatal hernia is a weakness in the __... click for more

HUman Biology

28. The outside layer of the heart a. fibrous pleura b. pericardium c. parietal pleura d. peritoneum 29. The superior vena cava enters the __________ of the heart. a. right ventricle b. right atrium c. left atrium d. left ventricle 30. The pulmonary semilunar valve prevents back flow of blood into the _____ a. right atrium b. left atrium c. right ventricle d. left ventricle 31. Which of the following contains blood with a relatively high oxygen content? a. left ventricle b. right ventricle c. right atrium d. superior vena cava 32. Which of the following contains blood with a relatively low oxygen content? a. left ventricle b. aorta c.... click for more

HUman Biology

28. The outside layer of the heart a. fibrous pleura b. pericardium c. parietal pleura d. peritoneum 29. The superior vena cava enters the __________ of the heart. a. right ventricle b. right atrium c. left atrium d. left ventricle 30. The pulmonary semilunar valve prevents back flow of blood into the _____ a. right atrium b. left atrium c. right ventricle d. left ventricle 31. Which of the following contains blood with a relatively high oxygen content? a. left ventricle b. right ventricle c. right atrium d. superior vena cava 32. Which of the following contains blood with a relatively low oxygen content? a. left ventricle b. aorta c.... click for more

HUman Biology

51. The structure of a lymphatic vessel is most similar to that of a(n) A. artery. B. arteriole. C. vein D. capillary. 52. The spleen A. is the largest lymphatic organ B. it filters the blood. C. it serves as a blood reservoir. D. all of the above 53. The spleen is much like a lymph node except that the spleen A. does not store lymphocytes. B. Filters lymph C. Filters blood. D. does not contain phagocytes. 54. The structure of a lymph node can be described as A. being divided into compartments that contain masses of lymphocytes and macrophages. B. afferent vessels circulating lymph into the node on is convex surface. C. efferent vessels circulating ... click for more

Human Biology

Which of the following statements is TRUE concerning muscle organization? a. Myosin filaments are attached to Z bands. b. Actin filaments are thin. c. Actin filaments border sarcomere. d. A muscle bundle is composed of tiny units called I Bands. _____ filament pulls itself down the _____ filament, causing the muscle to contract. a. actin, myosin b. myosin, actin c. myosin, sarcomere d. sarcomere, actin Smooth muscle tissue is a. Voluntary. b. Found in the heart. c. Found attached to bones. d. Involuntary. Skeletal muscle tissue is a. voluntary. b. Found in the heart. c. Found attached to bones. d. Both a and c This is the outer layer of skin. a. Hypodermis b... click for more