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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. Path where impulse travels from SA to AV node






2. Osmotic pressure in capillaries due to plasma proteins






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






4. Breakdown product of the hemogloblin heme group






5. Mother has Rh - blood with Rh+ antibodies that attack the babies Rh+ blood






6. 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






7. 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






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






9. Valves between the large arteries and the ventricles






10. Occurs when increased cardiac output is needed; the postganglionic nerve directly innervates the heart - releasing norepinephrine - increasing heart rate and force of contraction






11. Universal donor






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






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






14. Highest blood pressure that occurs during ventricular contraction






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






16. Number of systole contractions per unit time






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






18. Where blood passes through 2 sets of capillaries before returning to the heart; Evolved as direct transport routes






19. Excessive bleeding that results from defective proteins






20. 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






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






22. Flow of blood from the heart to the lungs - pumped by the right side of the heart






23. Destroy parasites and are involved in allergic rxns






24. Neural sympathetic input by postganglionic neuron of norepinephrine innervating arterial smooth muscle






25. Flow of blood through a tissue






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






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






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






29. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






30. Glycoproteins that are coded for by 3 alleles (A - B - i)






31. At position 6 - missense mutation substitutes valine for glutamate. valine is hydrophobic - where glutamate was charged. It is an autosomal recessive disease where RBCs accumulated in small vessels - heterozygote for (blank) shows resistance to malar






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






33. Transportation of blood though the body and exchange of material btw blood and tissues






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






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






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






37. 3 substances that can diffuse through intercellular cleft






38. Produced during cell metabolism and diffuses through the endothelial cells into the blood stream - where it is picked up by the liver and converted to forms that can be excreted (all other wastes are picked up by the kidneys)






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






40. The difference btw systolic and diastolic blood pressures






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






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






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






44. Ensure the one - way flow through the circulatory system






45. Allow Na to leak across membrane - causing cell potential to get closer to threshold potential; allow threshold to be reached for Ca channels to open let Ca into the cell






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






47. Resting membrane potential of -90mV and have long duration action potentials






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






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






50. 2 ways to increase venous return






Can you answer 50 questions in 15 minutes?



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