Question

28. Because the circulatory system is a closed system filled with fluid, the pulse wave is felt at the same time in any part of the body A. True B. False

26. During t\he normal cardiac cycle, there is never a time when both the atria and ventricles are relaxed. A. True B. False

25.Cardiac output remains constant in a slowly and weakly beating heart. A. True B. False

24. Hypoxic conditions act as a major stimulant to chemoreceptors. A. True B. False

21. Diastasis is associated with the rapid filling of the ventricles A. True B. False

20. All blood returns to the heart by way of either the superior vena cava or the inferior vena cava. A. True B. False 19. The SA node resides primarily in the right atrial wall A. True B. False

18. Echocardiography is an invasive technique for evaluating the internal structures and motions of the heart and greater vessels A. True B. False

17. The heart of the developing human embryo begins to beat regularly early in the fourth week after fertilization. A. True B. False

16. To maintain the homeostatic level of red blood cell production, the body must supply the bone marrow with recycled iron, amino acids and bilirubin A. True B. False

15. The rate of protein synthesis in mature red blood cells is slightly higher than in most of the cells in the body. A. True B. False

14. Hematocrit includes red blood cells, white blood cells, and soluble proteins from the plasma A. True B. False 13.Antithrombins are important in clot formation A. True B. False

12. Globulins play an important role in the body’s defence process A. True B. False

11. Globulins constitute approximately 55% of the total plasma protein content. A. True B. False

Answer 1

28) A) true

explanation: pulse wave is the pressure wave generated by the heart travelling along the walls of the blood vessels. This pressure wave is felt at the same time any place in the circulatory system.

26) B) False

explanation: both atria and ventricles are relaxed during ventricular filling phase just before the atrial contraction phase.

25) b) False'explanation: cardiac output decreases in slowly and weakly beating heart.

CO = HR x SV

cardiac output is directly proportional to the heart rate and stroke volume. Slow heart has low heart rate while weak heart has low stroke volume due to low pumping of the blood.

24. True

explanation: Hypoxia stimulates the chemoreceptors due decrease in oxygen concentration of the plasma.