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






2. Metabolic waste product in breakdown of amino acids






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






4. Neutrophil - eosinophil - and basophil






5. Number of systole contractions per unit time






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






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






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






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






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






11. Tissue which the cytoplasm of different cells communicate via gap junctions






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






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






14. Breakdown product of the hemogloblin heme group






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






16. Protein that maintains oncotic pressure in capillaries






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






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






19. ABO blood group and Rh blood group






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






21. Highest blood pressure that occurs during ventricular contraction






22. Produced during cell metabolism and diffuses through the endothelial cells into the blood stream - where it is picked up by the liver and converted to forms that can be excreted (all other wastes are picked up by the kidneys)






23. Purpose of erythrocytes?






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






25. 2 lymphocytes






26. Response by CNS when blood pressure is too high






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






28. 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






29. 2 portal systems to know






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






31. Body's mechanism of preventing bleeding






32. Valves between the large arteries and the ventricles






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






34. 3 substances that can diffuse through intercellular cleft






35. Destroy parasites and are involved in allergic rxns






36. The difference btw systolic and diastolic blood pressures






37. Path where impulse travels from SA to AV node






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






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






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






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






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






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






44. AV valve between left atrium and left ventricle






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






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






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






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






49. Glucose - amino acids - and fats






50. Reservoirs where blood collects from veins