e or False (20 points: 10@2 points each): Indicate whether the statement is true
ID: 3515912 • Letter: E
Question
e or False (20 points: 10@2 points each): Indicate whether the statement is true or false -ve Part A. Tru 1. ins return blood to the heart and arteries take blood away from the heart. 2.Arteries are vessels that always carry oxygenated blood 3. he contract ile cycle of the heart normally originates from a pacemaker cell within the brain (medulla) 4. One complete cardiac cycle represents one heartbeat. 5. The factor having the greatest influence on resistance to blood flow is the radi blood vessels. 6. 7. nt in fighting bacterial infections. The force that moves air into and out of the lungs is the difference in pressure between the atmosphere and alveolus. -Alveolar type l epithelial cells function to engulf pathogens and foreign particles that have been inhaled into the lungs. 8 9. The partial pressure of an individual gas within a mixture of gases is determined by the total pressure of those gases and the fractional concentration of that gas in the mixture. 10. Hyperventilation decreases blood pH (acidosis). Part B. Multiple Choice (80 points: 40@2 pts each): Select the best answer from the choices provide 11. When blood moves through the body it travels in a circular pattern. The general pattern of blood flow follows which sequence of vessels as it leaves the heart? a. arteries, arterioles, capillaries, venules, veins b. arteries, veins, venules, arterioles, capillaries C. d. veins, venules, capillaries, arterioles, arteries e. veins, capillaries, venules, arterioles, arteries 12. Which chamber of the heart ejects blood into the aorta? a. right atrium b. left ventricle c. left atrium d. right ventricleExplanation / Answer
1. True
2. False
3. False (pacemaker is in SA node in heart).
4. True
5. True (inversely proportional to r^4)
6. True
7. True
8. False (they secrete surfactant)
9. True
10. False (hyperventilation decrease pH)
11. A (as blood leave heart it enter major artery then into smaller arteriole which divide to form capillary then blood enter venules which join to form vein that drains into heart).
12. Left ventricle
13. A (explained above)
14. D
15. D (calcium moves inside and potassium out this maintain the plateau phase)
16. E (this correspond to phase 0 which is caused by opening of Sodium channel)
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