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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. Amount of blood pumped w/ each systolic contraction






2. The principle sugar in blood that maintains a relatively constant concentration for adequate nutrition






3. What is the direct cause of edema?






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






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






6. Excessive bleeding that results from defective proteins






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






8. Stretching to greater degree of heart muscle causes more forceful contraction; stretching increase occur by increasing fluid volume






9. Large particles consisting of fats - cholesterol - and carrier proteins; transport lipids through the blood stream






10. Metabolic waste product in breakdown of amino acids






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






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






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






14. Buffer in blood. Keeps pH around 7.4






15. 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






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






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






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






19. 1. depolarization caused by fast Na channels - where action potential through intercalated discs reaches threshold potential - opening Na channels 2. initial depolarization with Na channels closing and k channels opening - but Ca channels also open 3






20. Breakdown product of the hemogloblin heme group






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






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






23. Reservoirs where blood collects from veins






24. The difference btw systolic and diastolic blood pressures






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






26. First branches from the aorta that provide the heart's blood supply






27. 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






28. 2 portal systems to know






29. 2 ways to increase venous return






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






31. Blood clot or scab circulating in bloodstream






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






33. 3 factors that dictate the affinity of hemoglobin for O2






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






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






36. AV valve between left atrium and left ventricle






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






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






39. Body's mechanism of preventing bleeding






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






41. When do Rh antibodies develop?






42. Response by CNS when blood pressure is too high






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






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






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






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






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

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






49. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






50. 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






Can you answer 50 questions in 15 minutes?



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