Mr. Butler
AP Biology
AP Lab 10: Physiology of the Circulatory System
After doing this lab you should be able to:
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Describe the effect of changing body position on heart rate and blood pressure;
Explain how exercise changes heart rate;
Determine a human’s fitness index;
Discuss and explain the relationship between heart rate and temperature.
Topics for Discussion I:
1. Explain why blood pressure and heart rate differ when measured in a reclining position and in a
standing position.
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2. Explain why high blood pressure is a health concern.
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3. Explain why an athlete must exercise harder or longer to achieve a maximum heart rate than a
person who is not as physically fit.
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4. Research and explain why smoking causes a rise in blood pressure.
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Quiz I
1. Which of the following has the LEAST effect on blood pressure in a young adult?
a. Temperature of the room
b. Position of the body
c. Level of conditioning
d. Supplemental vitamins
2. An individual’s blood pressure is reported as 110/50. Which of the following is correct?
a. The pressure during the contraction phase of the heart is 50, and the pressure during
the relaxation phase is 110.
b. Systolic pressure is 110 and diastolic pressure is 50.
c. The pulse is 110 during exercise and 50 when at rest.
d. The individual shows possible borderline high blood pressure.
3. Which of the test results would be most typical of a well-conditioned athlete?
Resting
Pulse
Resting
BP
Return to Resting
Pulse After
Vigorous Exercise
a.
72
130/90
2 minutes
b.
48
110/80
30 seconds
c.
66
120/95
60 seconds
d.
84
110/75
90 seconds
4. Which of the test results indicate a person with the lowest level of fitness?
Resting
Pulse
Resting
BP
Return to Resting
Pulse After
Vigorous Exercise
a.
72
130/90
2 minutes
b.
48
110/80
30 seconds
c.
66
120/95
60 seconds
d.
84
110/75
90 seconds
Topics for Discussion II
5. Why does temperature affect heart rate in ectothermic organisms?
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6. Discuss what results you might obtain if you repeated this experiment (temperature on heart
rate of Daphnia magna) using an endothermic organism.
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7. Describe at least four ways an ectothermic organism’s behavior helps it regulate its
temperature.
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Quiz II
1. Which of the following organisms would show the greatest fluctuation in body temperature
hour by hour?
a. Dolphin
b. Mouse
c. Lake trout
d. Rattlesnake
2. What is the relationship between metabolic rate and body temperature in Daphnia?
a. As the body temperature increases, the metabolic rate decreases.
b. An increase of 10°C results in a doubling of the metabolic rate.
c. Heart rate increases as body temperature decreases.
d. Cellular enzymes are less active at 35°C than 20°C, resulting in decreased metabolic rate.
3. If Q10 = 2, then an enzymatic reaction that takes place at a given rate at 5°C would take place
approximately how many times faster at 25°C?
a. Twenty times
b. Eight times
c. Four times
d. Three times
e. Two times
4. Which of the following experimental conditions would be most life-threatening for an
ectothermic organism?
a. Temperatures that exceed 40°C
b. Temperatures that are between 3°C and 8°C