About how much of the oxygen content of arterial blood consists of oxygen molecules in solution?
A) 50%
B) 25%
C) 10%
D) 5%
E) 1.5%
E) 1.5%
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How many different hormones are secreted by the anterior pituitary?
a. 2 b. 3 c. 4 d. 5 e. 6
The smallest functional unit in the human body from a physiologic perspective is the:
a. nucleus b. atom c. cell d. tissue
Homeostasis depends on the activity of body systems to adjust a variable. Because our bodies work so well to maintain variables at set point, we often do not even notice the systems they use to do it. But in someone who is ill, these systems may not be able to maintain homeostasis; you need to be aware of this to head off possible problems.
Which statement accurately describes the effects of substrate and enzyme concentrations on reaction rate?
A. An increase in either substrate or enzyme concentration will increase the reaction rate. B. An increase in either substrate or enzyme concentration will decrease the reaction rate. C. An increase in substrate concentration increases the reaction rate, but enzyme concentration has no effect. D. A decrease in substrate concentration or an increase in enzyme concentration increases the reaction rate. E. An increase in substrate concentration or a decrease in enzyme concentration will increase the reaction rate.