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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. Phagocytose bacteria resulting in pus; amoeboid motility and chemotaxis






2. 3 substances that can diffuse through intercellular cleft






3. 2 ways to increase venous return






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






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






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






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






8. Response by CNS when blood pressure is too high






9. Excessive bleeding that results from defective proteins






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






11. 2 portal systems to know






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






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






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






15. Destroy parasites and are involved in allergic rxns






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






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






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






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






20. CO2 is soluble in H2O - and thus some is dissolved and carried to lungs and tissues in plasma - O2 is not soluble in plasma at all






21. 2 chambers of the heart






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






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






24. Hematocrit or RBC those compose 35-45% of the blood; cells are non - nucleated and have no organelles. Acquire ATP through glycolysis have biconcave shape to maximize surface area for binding O2






25. Path where impulse travels from SA to AV node






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






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






28. Where are RBCs broken down?






29. Metabolic waste product in breakdown of amino acids






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






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






32. The difference btw systolic and diastolic blood pressures






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






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






35. Flow of blood through a tissue






36. Breakdown product of the hemogloblin heme group






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






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

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






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






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






42. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






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






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






45. 3 factors that dictate the affinity of hemoglobin for O2






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






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






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






49. 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






50. When do Rh antibodies develop?