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MCAT Biology Circulatory System
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MCAT Biology Circulatory System
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25 Questions

1. AV valve between left atrium and left ventricle

2. What is the direct cause of edema?

3. ABO blood group and Rh blood group

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

5. Excessive bleeding that results from defective proteins

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

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

8. Path where impulse travels from SA to AV node

9. 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

10. Reservoirs where blood collects from veins

11. Osmotic pressure in capillaries due to plasma proteins

12. Why is the SA node the primary pacemaker?

13. Where blood passes through 2 sets of capillaries before returning to the heart; Evolved as direct transport routes

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

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

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

17. 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

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

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

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

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

22. Breakdown product of the hemogloblin heme group

23. 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)

24. Glucose - amino acids - and fats

25. Amount of blood pumped w/ each systolic contraction

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