A normal, healthy animal never contracts the flexor muscles and the extensor muscles of the same leg at the same time. Why not?
a. When the interneuron sends excitatory messages to one, inhibitory messages go to the other
b. Both muscles are mechanically connected in a way that makes it impossible for both to contract at the same time.
c. Such coordination is learned through prenatal movement.
d. Both muscles are controlled by branches of the same axon.
a
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Using her data set regarding the working conditions and stress levels of domestic workers, Callie has calculated the standard deviation of their housing expenses in two ways, with and without the workers who have zero housing expense. When she includes all workers, the standard deviation is ____
a. smaller b. larger c. the same d. scattered
Research regarding early intervention programs such as Head Start indicates that such programs a. are ineffective
b. may help improve the functioning of intellectually disabled children. c. may help prevent "at risk" children from developing intellectual disability. d. help parents manage the behavior of their intellectually disabled children.
Which of the following statements is true regarding new discoveries about genotypes and phenotypes?
Genes affect only a handful of behaviors. Most environmental influences on children raised in the same home are not shared. People tend to choose friends and associates based solely on social interactions. In nonidentical twins, genes elicit responses that are not explained in our current understanding.
The field of study concerned with how the nervous system interacts with the immune system is known as ____.
A. endocrinology B. immunopsychology C. psychoneuroimmunology D. neurobiology