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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. 2 chambers of the heart






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






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






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






5. Plasma that lacks clotting proteins






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






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






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






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






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






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






12. AV valve between left atrium and left ventricle






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






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






15. 2 lymphocytes






16. 3 substances that can diffuse through intercellular cleft






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






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






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






20. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






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






22. 2 ways to increase venous return






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






24. Return of blood to the heart by the vena cava - where increased venous return causes increased stretching of the muscle (increases stroke volume)






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






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






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






28. Which is longer - diastole or systole?






29. 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






30. Fat storage cells of the body






31. Flow of blood through a tissue






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






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






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






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






36. Protein that maintains oncotic pressure in capillaries






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






38. Site of exchange btw blood and tissues; smallest vessels that allow one RBC through at a time






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






40. Buffer in blood. Keeps pH around 7.4






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






42. 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






43. Osmotic pressure in capillaries due to plasma proteins






44. Pump blood out of the heart at high pressures into arteries






45. Neutrophil - eosinophil - and basophil






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






47. Universal acceptor






48. Amount of blood pumped w/ each systolic contraction






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






50. Confirmation of hemoglobin with no O2 bound - so it has low affinity







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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