SOLUTION APPROVED CH387 Human Physiology Quiz #6 E Hours (30 points)
MATCHING: Choose ALL correct answers (3 points each) 1. __B/D__ all valves are closed 2. ___C___ ventricular volume decreases 3. ___A___ atria fill with blood Multiple Choice (3 points each) 4. Which of the following components of the ECG represents ventricular depolarization? a. P wave b. QRS complex c. T wave 5. During ventricular ejection, ________. a. b. c. d. e. the AV valves are open the semilunar valves are open left ventricular pressure > aortic pressure both B and C all of the above A. B. C. D.
Name _________________________ 6 March 2007
Ventricular filling Isovolumetric contraction Ventricular ejection Isovolumetric relaxation
8. Arteries have __ compliance and __ resistance. a. b. c. d. low : low high : high low : high high : low
9. In the circulatory system, the largest pressure drop occurs across _____________. a. b. d. c. arteries arterioles capillaries venules
6. Which of the following decreases heart rate? a. b. c. d. e. sympathetic nervous system activity parasympathetic nervous system activity epinephrine glucagon all of the above are true EXTRA CREDIT (3 points) What causes your foot to "fall asleep?"
Nerve pathways can become blocked, preventing normal transmission of electrochemical impulses to the brain. Some of the nerves, starved or pinched or both, stop firing while others fire hyperactively. This leads to mixed signals being sent to the brain, where they are interpreted as burning, prickling or tingling feelings. It is these sensations, known medically as paresthesia, that alert you to move your foot.
7. The pressure in the large systemic veins leading into the heart is called ____________. a. b. c. d. e. preload afterload peripheral venous systemic venous pressure central venous pressure