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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. Body's mechanism of preventing bleeding






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






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






4. Fat storage cells of the body






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






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






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






8. When do semilunar valves close?






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






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






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






12. Osmotic pressure in capillaries due to plasma proteins






13. Metabolic waste product in breakdown of amino acids






14. Plasma that lacks clotting proteins






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






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






17. Response by CNS when blood pressure is too low






18. What is the only process RBC use to generate ATP?






19. 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






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






21. 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






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






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






24. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






25. 2 lymphocytes






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






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






28. Reservoirs where blood collects from veins






29. Heart rate *stroke volume= (units)






30. Why is the SA node the primary pacemaker?






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






32. Gap junctions in the cardiac muscle - where depolarization is communicated directly btw cytoplasm of neighboring cardiac cells






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






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






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






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






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






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






39. When the valve of a vein fails and back flow occurs; blood not being moved toward the heart






40. 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






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






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






43. AV valve between left atrium and left ventricle






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






45. 3 substances that can diffuse through intercellular cleft






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






48. Response by CNS when blood pressure is too high






49. Valves between the large arteries and the ventricles






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







Sorry!:) No result found.

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