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






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






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






4. First branches from the aorta that provide the heart's blood supply






5. Absorbed by the GI tract and brought to the liver via the hepatic portal vein - where they are stored in the liver and enter the blood stream when needed






6. Body's mechanism of preventing bleeding






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






8. When do semilunar valves close?






9. Blood clot or scab circulating in bloodstream






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






11. 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






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






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






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






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






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






17. Neutrophil - eosinophil - and basophil






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






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






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






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






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






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






24. Valves between the large arteries and the ventricles






25. Path where impulse travels from SA to AV node






26. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






27. 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






28. 20% transported stuck to hemoglobin; why increased pCO2 decreases affinity of O2






29. What is the direct cause of edema?






30. AV valve between left atrium and left ventricle






31. ABO blood group and Rh blood group






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






33. Reservoirs where blood collects from veins






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






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






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






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






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






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






40. 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






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






42. Metabolic waste product in breakdown of amino acids






43. Destroy parasites and are involved in allergic rxns






44. 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






45. Where are RBCs broken down?






46. Force per unit area exerted by blood on walls of arteries






47. Universal acceptor






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






49. Which is longer - diastole or systole?






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







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