Through their experiments, Fritsch and Hitzig showed that:
a. The muscle in a frog's leg can be made to move by stimulating the nerve connected to it, even if the muscle had been removed from the body.
b. The rate of nerve conduction is about 90 feet per second.
c. The left hemisphere controls speech.
d. Sensation is the result of electrical activity in the brain.
A
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Among widowed people, what is their own risk of death during the first year after the death of their spouse?
A. 30 times higher than normal B. 20 times higher than normal C. 12 times higher than normal D. 7 times higher than normal
Which statement best describes the biological system?
a. All the environmental influences on an individual's health b. All the processes through which a person becomes integrated into society c. All the processes necessary for the physiological functions of an organism d. All the mental processes central to making sense of experiences
Piaget's sensorimotor stage includes the period of
a. infancy. b. early childhood. c. middle childhood. d. adolescence.
Females of most mammalian species (among them dogs, cats, and rats) are MOST interested in sex when they:
A) are ovulating. B) feel a strong urge to reproduce. C) have low testosterone and low estrogen levels. D) have high testosterone and low estrogen levels.