Test your basic knowledge |

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






2. 2 portal systems to know






3. Blood clot or scab circulating in bloodstream






4. Buffer in blood. Keeps pH around 7.4






5. Heart rate *stroke volume= (units)






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






7. Plasma that lacks clotting proteins






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






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






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






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






12. 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






13. Excessive bleeding that results from defective proteins






14. Response by CNS when blood pressure is too low






15. Store and release histamine and are involved in allergic rxns






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






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






18. 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






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






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






21. ABO blood group and Rh blood group






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






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






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






25. 3 substances that can diffuse through intercellular cleft






26. Highest blood pressure that occurs during ventricular contraction






27. Number of systole contractions per unit time






28. Protein that maintains oncotic pressure in capillaries






29. Osmotic pressure in capillaries due to plasma proteins






30. Which is longer - diastole or systole?






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






32. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






33. Capillaries dilate - increasing the cleft size - which allows more H2O to move through to tissues






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






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






36. Destroy parasites and are involved in allergic rxns






37. 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






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






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






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






41. Where are RBCs broken down?






42. Where do all components of the blood develop from?






43. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






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






46. Precursor to fibrin - which is necessary for blood clotting






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






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






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






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