17. Which of the following events listed occurs FIRST following an action potent

Question

17. Which of the following events listed occurs FIRST following an action potential generation SA node? a. reploarization of the atria b. the P wave of the ECG c. repolarization of the ventricles d. the T wave of the ECG e. depolarization of the ventricles 18. Which of the following occurs when the ventricles are in systole? a. the pressure in the ventricles decrease b. the atria are in systole c. the trio ventricular valves open d. blood enters the ventricles e. none of the above 19. The pulmonary veins are connected to the _____ of the heart? a. right atrium b. left atrium c. right ventricle d. left ventricle 20. Which of the following will decrease blood pressure? a.release of acetylcholine onto the cells of the SA node b. activation of the cardioacceletory center c. secretion of hormones from the adrenal medulla d. an increase in the amount of blood that fills the ventricles during ventricular diastole e. vasoconstriction 21. Oxygenated blood will be found in the ________ a. hepatic portal vein b. pulmonary valve c. vena cava d. pulmonary vein e. none of the above 22. Which tunic(s) are not present in capillaries ? a. tunica externa b. tunica media c. tunica interna d. a and b e. b and c 23. Filtration of plasma into the nephron occurs across the wall of the _____ a. peritubular capillaries b. glomerulus c. afferent arterioles d. efferent arterioles e. vasa recta capillaries 24. The ____ is the part of the nephron that is found in the medulla of the kidney. a. pelvis b. ascending loop of hence c. Bowmans capsule d. juxtagolmerular apparatus e. ureter 25. Glucose is NOT normally found in urine because a. does not pass through the walls of the glomerulus b. is used ny the kidney for cellular respiration c. is actively reabsorbed by the tubule cells d. is removed by the body cells before blood reaches the kidney e. all of the above 26. Which if the following hormones act in the kidneys to decrease blood pressure? a. ADH b. Aldosterone c. ANH d. a and b e. b and c

Explanation / Answer

17. B. (the P wave of the ECG)

18. C. the atrioventricular valves open

19. b. left atrium

20.  a.release of acetylcholine onto the cells of the SA node

21. d. pulmonary vein(deoxygenated blood - pulmonary artery)

22. c. tunica interna (tunica intima is present not interna)

23. b. glomerulus

24. b. ascending loop of Henle

25. c. is actively reabsorbed by the tubule cells

26. c. ANP(atrial natriuretic peptide)

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