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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. Response by CNS when blood pressure is too low






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






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






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






5. 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






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






7. 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






8. Osmotic pressure in capillaries due to plasma proteins






9. Neutrophil - eosinophil - and basophil






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






11. Reservoirs where blood collects from veins






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






13. Protein in RBC that transport O2 though the blood since O2 is too hydrophobic in plasma; protein has 4 subunits that change confirmation cooperatively depending on the concentration of O2






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






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






16. Universal donor






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






18. AV valve between right atrium and right ventricle






19. Which is longer - diastole or systole?






20. The difference btw systolic and diastolic blood pressures






21. Metabolic waste product in breakdown of amino acids






22. AV valve between left atrium and left ventricle






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






24. Excessive bleeding that results from defective proteins






25. 2 lymphocytes






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

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






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






29. 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






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






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






32. Breakdown product of the hemogloblin heme group






33. Valves between the large arteries and the ventricles






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






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






36. Where are RBCs broken down?






37. Protein that maintains oncotic pressure in capillaries






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






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






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






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






42. Path where impulse travels from SA to AV node






43. 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






44. Highest blood pressure that occurs during ventricular contraction






45. Destroy parasites and are involved in allergic rxns






46. What is the direct cause of edema?






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






48. Body's mechanism of preventing bleeding






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






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