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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. Glucose - amino acids - and fats






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






3. Path where impulse travels from SA to AV node






4. Crosses septum and connects to Purkinje fibers to allow coordinated contraction of ventricles. Key is that is slows transmission across septum to allow ventricles to fully fill before contraction






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






6. Amount of blood pumped w/ each systolic contraction






7. 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






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






9. 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






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






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






12. Have single layer endothelial cells w/ spaces in between cells called intercellular cleft






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






14. Pass through the capillaries in order to patrol the tissue for invading organisms; only macrophages and neutrophils can squeeze through cleft






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






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






17. 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






18. 73% of CO2 converted to carbonic acid by carbonic anhydrase - and carbonic acid is converted to bicarbonate - which acts a buffer






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. When do Rh antibodies develop?






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






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






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






24. 2 lymphocytes






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






26. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






27. Purpose of erythrocytes?






28. AV valve between right atrium and right ventricle






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






30. Valves between the large arteries and the ventricles






31. Where are RBCs broken down?






32. Breakdown product of the hemogloblin heme group






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






34. 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






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






36. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






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






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






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






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






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






42. Flow of blood through a tissue






43. 2 chambers of the heart






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






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






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






47. Highest blood pressure that occurs during ventricular contraction






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






49. Reservoirs where blood collects from veins






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







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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