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






2. Protein that maintains oncotic pressure in capillaries






3. Response by CNS when blood pressure is too low






4. Voltage - gated channels that open quickly; open at threshold potential






5. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






6. When do semilunar valves close?






7. Valves between the large arteries and the ventricles






8. When do Rh antibodies develop?






9. 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






10. Metabolic waste product in breakdown of amino acids






11. 2 lymphocytes






12. Lipoproteins that enter lacteal vessels of lymphatic system in the intestinal wall






13. ABO blood group and Rh blood group






14. Heart rate *stroke volume= (units)






15. Blood clot or scab circulating in bloodstream






16. Bone marrow cells that give rise to RBC and platelets






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






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






19. Pump blood out of the heart at high pressures into arteries






20. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






21. Purpose of erythrocytes?






22. Vessels where deoxygenated blood from coronary sinus continue to flow into heart






23. Destroy parasites and are involved in allergic rxns






24. Osmotic pressure in capillaries due to plasma proteins






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






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






27. Excessive bleeding that results from defective proteins






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






29. Pass through the capillaries in order to patrol the tissue for invading organisms; only macrophages and neutrophils can squeeze through cleft






30. Receives deoxygenated blood from systemic circulation (superior and inferior vena cava)






31. Region that initiates start of cardiac cycle - which acts as a pacemaker of the heart; has unstable resting potential due to Na leak channels






32. Fat storage cells of the body






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






34. Hematocrit or RBC those compose 35-45% of the blood; cells are non - nucleated and have no organelles. Acquire ATP through glycolysis have biconcave shape to maximize surface area for binding O2






35. Flow of blood through a tissue






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






37. Universal acceptor






38. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






39. Neutrophil - eosinophil - and basophil






40. Monocyte that phagocytoses debris and microorganisms - has amoeboid motility - and displays chemotaxis






41. Inadequate blood flow - resulting in tissue damage due to shortage of O2 and nutrients - and increase of metabolic waste






42. Breakdown product of the hemogloblin heme group






43. Because the veins have essentially 0 pressure - these valves ensure one - way flow - skeletal muscle contraction encourages flow through veins






44. Path where impulse travels from SA to AV node






45. Opposing friction force to flow - which increases with decreased radius; determined by degree of contraction of arterial smooth muscle






46. Buffer in blood. Keeps pH around 7.4






47. Control of by ANS of rate of contraction through the Vagus nerve. Postganglionic release in SA node of ACH inhibits depolarization






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






49. Connects the two capillary beds of the intestine and the liver






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