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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. Stretching to greater degree of heart muscle causes more forceful contraction; stretching increase occur by increasing fluid volume






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






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






4. Number of systole contractions per unit time






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






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






7. 2 chambers of the heart






8. 2 portal systems to know






9. Reservoirs where blood collects from veins






10. The difference btw systolic and diastolic blood pressures






11. Why is the SA node the primary pacemaker?






12. Where are RBCs broken down?






13. Blood clot or scab circulating in bloodstream






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






15. 3 substances that can diffuse through intercellular cleft






16. Heart rate *stroke volume= (units)






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






18. Buffer in blood. Keeps pH around 7.4






19. 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






20. Highest blood pressure that occurs during ventricular contraction






21. Response by CNS when blood pressure is too low






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






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






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






25. 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






26. Excessive bleeding that results from defective proteins






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






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






29. Glucose - amino acids - and fats






30. Amount of blood pumped w/ each systolic contraction






31. Fat storage cells of the body






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






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






34. Rh factor that follows dominant pattern (Rh+ in heterozygote)






35. Breakdown product of the hemogloblin heme group






36. What is the direct cause of edema?






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






38. Purpose of erythrocytes?






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






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






41. Path where impulse travels from SA to AV node






42. Produced during cell metabolism and diffuses through the endothelial cells into the blood stream - where it is picked up by the liver and converted to forms that can be excreted (all other wastes are picked up by the kidneys)






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






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






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






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






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






48. 55% of whole blood that is composed of electrolytes - lipoproteins - sugars - buffer - and metabolic waste






49. AV valve between left atrium and left ventricle






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