Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of
A. positive feedback control.
B. negative feedback control.
C. a failure of homeostasis.
D. feedforward regulation.
E. open loop feedback.
D. feedforward regulation.
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All of the following apply to the deep sea except:
a. temperatures vary greatly in deep waters. b. pressures are very high. c. light is dim or nonexistent. d. the water is extremely cold.
How many chromosomes are present in human somatic cells?
a. 22 b. 23 c. 44 d. 46 e. 48
Which theory was helpful to Darwin in the
formulation of his theory of evolution? a. catastrophism b. inheritance of acquired characteristics c. uniformitarianism d. continental drift e. special creationism
Why is cancer more prevalent in older individuals?
a. Cancer cells form at a faster rate. b. More mutations develop with age. c. The protective action of cytotoxic T cells breaks down with age. d. Cancers learn to disguise themselves as "self" with time. e. Older people tend to be exposed to more dangerous chemicals.