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






2. Fat storage cells of the body






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






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






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






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






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






8. Protein that maintains oncotic pressure in capillaries






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






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






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






12. Number of systole contractions per unit time






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






14. Which is longer - diastole or systole?






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






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






17. 3 substances that can diffuse through intercellular cleft






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






19. Amount of blood pumped w/ each systolic contraction






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






21. When do semilunar valves close?






22. 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






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






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






25. Resting membrane potential of -90mV and have long duration action potentials






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






27. 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






28. Universal acceptor






29. ABO blood group and Rh blood group






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






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






32. Osmotic pressure in capillaries due to plasma proteins






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






34. Contraction of the ventricles - where pressure increases rapidly - causing AV valves to close - Marks the beginning of the 'lub' sound






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






36. 2 lymphocytes






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






38. Response by CNS when blood pressure is too high






39. Excessive bleeding that results from defective proteins






40. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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






42. 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






43. Path where impulse travels from SA to AV node






44. 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






45. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels






46. 3 factors that dictate the affinity of hemoglobin for O2






47. Purpose of erythrocytes?






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






49. Reservoirs where blood collects from veins






50. Buffer in blood. Keeps pH around 7.4






Can you answer 50 questions in 15 minutes?



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