What is the result of sympathetic stimulation to the heart?
A. Decreased cardiac output
B. Decreased heart rate
C. Increased heart rate and force
D. Decreased intraventricular pressure
E. Squeezing of the pericardial sac
C. Increased heart rate and force
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The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "A"?
A. site of protein synthesis B. major site of ATP synthesis when oxygen is available C. outer boundary of cell, controls entry and exit of substances D. contains digestive enzymes E. directs cellular activities, contains DNA
What factor affects hair texture?
A. The length of the shaft B. The amount of keratin in the hair shaft C. The color of the hair shaft D. The shaft's cross-sectional shape
What is the order of the blood vessels that a red blood cell would pass through as the blood leaves the heart, travels to a tissue, and then returns to the heart?
A. Arteriole, artery, capillary, vein, venule B. Vein, capillary, artery, arteriole, venule C. Artery, venule, capillary, arteriole, vein D. Capillary, arteriole, artery, vein, venule E. Artery, arteriole, capillary, venule, vein
Carbon dioxide and water readily combine to form carbonic acid. The change in pH as the acid dissociates can be demonstrated with an indicator dye that changes color at a particular pH. In your physiology lab, you perform this experiment in two beakers containing room-temperature water and indicator, labeled Resting and Exercise based upon the status of the student who exhaled through a straw
into the solution. The Resting student had been sitting at the table for 30 minutes before exhaling while the Exercise student had just finished sprinting up the stairs to class late. A stopwatch was used to measure how long it took for the solutions to change color. The following data were generated by the students. Explain why the time required for the color to change was different between groups, using the word substrate in your answer.
