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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. Fat storage cells of the body






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






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






4. Where are RBCs broken down?






5. Universal donor






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






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






8. What is the direct cause of edema?






9. Glucose - amino acids - and fats






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






11. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






12. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






14. Number of systole contractions per unit time






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






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






17. Have single layer endothelial cells w/ spaces in between cells called intercellular cleft






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






19. Destroy parasites and are involved in allergic rxns






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






21. Why is the SA node the primary pacemaker?






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






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






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






25. Breakdown product of the hemogloblin heme group






26. 2 ways to increase venous return






27. What is the only process RBC use to generate ATP?






28. Blood clot or scab circulating in bloodstream






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






30. Store and release histamine and are involved in allergic rxns






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






32. Confirmation of hemoglobin with no O2 bound - so it has low affinity






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






34. Where do all components of the blood develop from?






35. Request by tissues to increase blood flow - where build up of metabolic waste causes arterioles to dialate






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






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






38. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






39. 3 substances that can diffuse through intercellular cleft






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

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






42. 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






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






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






45. AV valve between right atrium and right ventricle






46. Response by CNS when blood pressure is too high






47. 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






48. Universal acceptor






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






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







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