Without regular supplies of some hormones our capacity to behave would be seriously impaired; without others we would soon die. Tiny amounts of some hormones can modify our moods and our action, our inclination to eat or drink, our aggressiveness or submissiveness, and our reproductive and parental behavior. And hormones do more than influence adult behavior; early in life they help to determine the development of bodily form and may even determine an individual’s behavioral capacities. Later in life the changing outputs of some endocrine glands and the body’s changing sensitivity to some hormones are essential aspects of the phenomena of aging.
Communication within the body and the consequent integration of behavior were considered the exclusive province of the nervous system up to the beginning of the present century. The emergence of endocrinology as a separate discipline can probable be traced to the experiments of Bayliss and Starling on the hormone secre
A. To explain the specific functions of various hormones.
B. To provide general information about hormones.
C. To explain how the term "hormone" evolved.
D. To report on experiments in endocrinology.
Hardly a week goes by without some advance in technology that would have seemed incredible 50 years ago. And we can expect the rate of change to accelerate rather than slow down within our lifetime. The developments in technology are bound to have a dramatic effect on the future of work. By 2010, new technology will have revolutionized communications. People will be transmitting messages down telephone lines that previously would have been sent by post. Not only postmen but also clerks and secretaries will vanish in a paperfree society. All the routine tasks they perform will be carried on a tiny silicon chip so that they will be as obsolete as the horse and cart after the invention of the motor car. One change will make thousands, if not millions, redundant.
Even people in traditional professions, where expert knowledge has been the key, are unlikely to escape the effects of new technology. Instead of going to a solicitor, you might go to a computer which is programmed w
A. children will not be taught in schools
B. no teachers will be needed
C. teachers will be less knowledgeable
D. children will learn life skills at school
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