Following an action potential, the _____ returns the ions to their resting state concentrations.
A. diffusion gradient
B. sodium-potassium pump
C. action potential
D. resting membrane potential
Answer: B
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Children with PKU may show very different outcomes with and without exposure to phenylalanine in the diet. This demonstrates the role of __________.
A. a genetic disorder B. gene-environment interaction C. heritability D. variable phenotypes
_____ is a plant from the South Pacific that has been used for its sedating and relaxing effects
a. Kava b. Gingko Biloba c. Melatonin d. Ephedra
Compared to "pop psychology," psychology
a. is based on research evidence. b. is less complex. c. addresses only human behavior. d. is narrower in the issues it addresses.
The opponent-process theory of color vision contends that color vision is a result of
a. lateral inhibition on the retina itself. b. lateral inhibition in the visual cortex. c. calculation of differences in the firing rates of three types of retinal cells. d. competition between three types of rods and three types of cones.