A&P II FINAL EXAM STUDY (ACTUAL) LATEST WITH EXPERT CERTIFIED QUESTIONS AND ANSWERS I ALREADY GRADED A+ 100% PASS The most important factor in the regulation of the heart rate is a. acidosis b. autonomic nervous system stimulation c. stroke volume d. extracellular calcium levels - ANSWERS -b. autonomic nervous system stimulation Which of the following is not a difference between skeletal and cardiac muscle? a. cardiac muscle has a longer refractory period b. cardiac muscle exhibits automaticity c. cardiac muscle has striations d. cardiac muscle has gap junctions - ANSWERS -c. cardiac muscle has striations Cardiac muscle cells use _____ ions for the plateau phase of the action potential. a. calcium b. potassium c. sodium d. chloride - ANSWERS -a. cal cium Pressure in the ventricles is greatest when a. they are filling b. they are relaxed c. they are in diastole d. they are in systole - ANSWERS -d. they are in systole During ventricular systole, AV valves close because a. atrial pressure decreases b. atrial pressure increases c. ventricular pressure decreases d. ventricular pressure increases - ANSWERS -d. ventricular pressure increases Blood flow would be increased by a. decreasing vessel diameter b. increasing blood vessel length c. increasing c ardiac output d. decreasing blood pressure - ANSWERS -c. increasing cardiac output Fluids would be likely to leave or filter out of the capillary if: a. osmotic pressure in the capillary is high b. net hydrostatic pressure is greater than net osmotic pres sure c. net hydrostatic pressure is less than net osmotic pressure d. net filtration pressure is negative - ANSWERS -b. net hydrostatic pressure is greater than net osmotic pressure The resistance that has the most effect on blood pressure is from a. leng th of blood vessels b. diameter of blood vessels c. viscosity of blood d. none of these - ANSWERS -b. diameter of blood vessels Blood flow through the tissues is responsible for a. urine formation b. removal of wastes from tissue cells c. gas exchange in the lungs d. all of these - ANSWERS -d. all of these Which type of blood vessel has the most elastic tissue? a. arteries b. veins c. capillaries d. venules - ANSWERS -a. arteries True/False: Fever is seldom beneficial because it speeds up the cellular metabolic rate and will not allow antigen -antibody reactions to occur. - ANSWERS -False The two intrinsic defense systems have many components. Which of the following cell types is not a contributor to specific immunity a. natural killer c ells b. plasma cells c. t-cells d. b-cells - ANSWERS -a. natural killer cells
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