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






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






3. Body's mechanism of preventing bleeding






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






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






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






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






8. Excessive bleeding that results from defective proteins






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






10. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






11. When do Rh antibodies develop?






12. Confirmation of hemoglobin with O2 bound - where affinity is high 1. pH 2. pCO2 3.






13. 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






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






15. The difference in pressure divided blood flow; controlled by the sympathetic nervous system generating adrenergic tone






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






17. 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)






18. Metabolic waste product in breakdown of amino acids






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






20. Adequate circulation - but O2 supply is reduced (no build up waste products or loss of nutrients)






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






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






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






24. AV valve between left atrium and left ventricle






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






26. Universal donor






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






28. Response by CNS when blood pressure is too high






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






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






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






32. Caused by closure of Ca channels and opening of K channels






33. Glucose - amino acids - and fats






34. Valves between the large arteries and the ventricles






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






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






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






38. Plasma that lacks clotting proteins






39. Heart rate *stroke volume= (units)






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






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






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






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






44. Gap junctions in the cardiac muscle - where depolarization is communicated directly btw cytoplasm of neighboring cardiac cells






45. Fat storage cells of the body






46. Osmotic pressure in capillaries due to plasma proteins






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






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






49. Number of systole contractions per unit time






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