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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. Highest blood pressure that occurs during ventricular contraction






2. ABO blood group and Rh blood group






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






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






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






6. 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






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






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






9. 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






10. Flow of blood through a tissue






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






12. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






13. Osmotic pressure in capillaries due to plasma proteins






14. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






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






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






17. Reservoirs where blood collects from veins






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






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






20. 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






21. 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






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






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






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






25. Response by CNS when blood pressure is too high






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






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






28. Why is the SA node the primary pacemaker?






29. 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






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






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






32. AV valve between left atrium and left ventricle






33. Which is longer - diastole or systole?






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






35. Response by CNS when blood pressure is too low






36. Metabolic waste product in breakdown of amino acids






37. Valves between the large arteries and the ventricles






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






39. Number of systole contractions per unit time






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






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






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






43. Breakdown product of the hemogloblin heme group






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






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






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






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






48. AV valve between right atrium and right ventricle






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






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