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MCAT Biology Circulatory System
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MCAT Biology Circulatory System
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25 Questions

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

2. The difference in pressure divided blood flow; controlled by the sympathetic nervous system generating adrenergic tone

3. Universal acceptor

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

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

6. Allow Na to leak across membrane - causing cell potential to get closer to threshold potential; allow threshold to be reached for Ca channels to open let Ca into the cell

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

8. 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

9. Breakdown product of the hemogloblin heme group

10. Amount of blood pumped w/ each systolic contraction

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

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

13. Which is longer - diastole or systole?

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

15. When do Rh antibodies develop?

16. Open when threshold is reached causing membrane potential to increase/depolarize; operate slower than Na channels

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

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

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

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

21. 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)

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

23. Heart rate *stroke volume= (units)

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

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

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