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






2. Which is longer - diastole or systole?






3. Response by CNS when blood pressure is too high






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






5. Vessels that carry blood away from the heart at high pressure






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






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






8. Osmotic pressure in capillaries due to plasma proteins






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






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






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






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






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






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






15. Universal donor






16. Blood clot or scab circulating in bloodstream






17. Metabolic waste product in breakdown of amino acids






18. AV valve between right atrium and right ventricle






19. 2 chambers of the heart






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






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






22. Glucose - amino acids - and fats






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






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






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






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






27. 2 ways to increase venous return






28. Valves between the large arteries and the ventricles






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






30. Body's mechanism of preventing bleeding






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






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






33. 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






34. Response by CNS when blood pressure is too low






35. Purpose of erythrocytes?






36. Number of systole contractions per unit time






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






38. When do Rh antibodies develop?






39. Fat storage cells of the body






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






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






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






43. 2 lymphocytes






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






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






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






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






48. When the valve of a vein fails and back flow occurs; blood not being moved toward the heart






49. Filling of the ventricles by squeezing of the atria - marks the beginning of the 'dub' sound






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