You conduct an experiment on twenty 18-year-old male subjects to see how various intensities of exercise influence heart rate. Which of the following is/are considered an independent variable?
A) heart rate
B) age of subjects
C) intensity of exercise
D) sex of subjects
E) More than one of the answers is correct.
C) intensity of exercise
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How is the MRI imaging technique different from a CT imaging technique?
A) One is used for transverse images whereas the other can be used for any orientation of the image. B) One procedure is cheap and the other is very expensive. C) One requires the injection of radioactive dyes and the other does not. D) One uses X-ray technology and the other does not. E) One is used on superficial problems and the other is used to see inside of the body.
About 85 percent of the nephrons are classified as
A) renal. B) medullary. C) cortical. D) juxtamedullary. E) None of the answers are correct.
The first of the two numbers measured when taking the blood pressure represents ________
A) diastolic pressure B) isovolumetric pressure C) pulse pressure D) systolic pressure
Compare rods with cones
A) Rods are active in dim light, and objects appear black and white. Cones require intense light, and objects appear in color. B) Rods require intense light, and objects appear black and white. Cones are active in dim light, and objects appear in color. C) Rods are active in dim light, and objects appear in color. Cones require intense light, and objects appear in black and white. D) Rods require intense light, and objects appear in color. Cones are active in dim light, and objects appear in black and white. E) Both rods and cones require intense light. Rods allow color vision and cones allow objects to appear black and white.