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MCAT Biology Circulatory System

Subjects : mcat, health-sciences
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. 2 chambers of the heart






2. Stretching to greater degree of heart muscle causes more forceful contraction; stretching increase occur by increasing fluid volume






3. Voltage - gated channels that stay open longer than Na channels and open later responsible for the plateau phase of cardiac muscle contraction






4. Tissue which the cytoplasm of different cells communicate via gap junctions






5. When do semilunar valves close?






6. Flow of blood through a tissue






7. Aggregate at site of damage to a blood vessel and form a platelet plug to stop bleeding






8. Precursor to fibrin - which is necessary for blood clotting






9. Connected to SA node via internodal tract - and passes signal to Common bundle of His to contract ventricles






10. Key proteins for the function of the immune system that are produced and released by B- cells






11. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






12. Absorbed in the intestine and packaged in chylomicrons - which enter the lymphatic system - and dumped into the subclavian vein via the thoracic duct; the liver takes fats once in blood - converts them to another lipoprotein and sends them to adipocy






13. Maximize entry of Ca into the cell by allowing entry of Ca extracellular environment; leads to contraction of actin - myosin fibers






14. Valves between the ventricle and the atria to prevent back flow






15. Large particles consisting of fats - cholesterol - and carrier proteins; transport lipids through the blood stream






16. Peptide hormone secreted from the kidneys to increase RBC production in bone marrow






17. Osmotic pressure in capillaries due to plasma proteins






18. Rh factor that follows dominant pattern (Rh+ in heterozygote)






19. Path where impulse travels from SA to AV node






20. Force per unit area exerted by blood on walls of arteries






21. Essentially 0 mmHg - which results b/c of branching of vessels dissipating pressure to overcome resistance






22. Is cardiac output the same or different btw the two ventricles?






23. Capillaries dilate - increasing the cleft size - which allows more H2O to move through to tissues






24. Breakdown product of the hemogloblin heme group






25. What causes tendency of water flow out of blood?






26. Site of exchange btw blood and tissues; smallest vessels that allow one RBC through at a time






27. Muscular pump that forces blood through series of branching vessels






28. Plasma that lacks clotting proteins






29. ABO blood group and Rh blood group






30. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






31. 3 substances that can diffuse through intercellular cleft






32. Active form of fibrinogen - protein forms a mesh that holds platelet plug together to protect wound - ibrinogen is converted to (blank) by thrombin






33. Response by CNS when blood pressure is too low






34. Universal acceptor






35. Neutrophil - eosinophil - and basophil






36. 2 portal systems to know






37. Flow from the heart to the rest of the body; pumped by the left side of the heart






38. As low as pressure gets btw heart beats in arteries






39. Vessels that carry blood back to the heart at low pressure






40. Metabolic waste product in breakdown of amino acids






41. Destroy parasites and are involved in allergic rxns






42. Pool of deoxygenated blood at low pressure - which collects blood from coronary veins - Only deoxygenated blood to not enter the right atrium via the vena cava






43. Receptors in the carotid arteries and aortic arch that notify CNS if blood pressure is high or low






44. Excessive bleeding that results from defective proteins






45. Difference in pressure=blood flow (L/min)*resitance ^P=Q*R

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46. What is the most important plasma protein in the body? Why?






47. Reservoirs where blood collects from veins






48. What is the direct cause of edema?






49. Why is the SA node the primary pacemaker?






50. At the end of the capillary - is the osmotic pressure high or low?