首页
登录
职称英语
Without regular supplies of some hormones our capacity to behave would be se
Without regular supplies of some hormones our capacity to behave would be se
游客
2023-12-23
53
管理
问题
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 moods and actions, 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 probably be traced to the experiments of Bayliss and Starling on the hormone secretion. This substance is secreted from cells in the intestinal walls when food enters the stomach; it travels through the bloodstream and stimulates the pancreas to liberate pancreatic juice, which aids in digestion. By showing that special cells secrete chemical agents that are conveyed by the bloodstream and regulate distant target organs or tissues. Bayliss and Starling demonstrated that chemical integration could occur without participation of the nervous system.
The term "hormone" was first used with reference to secretion. Starling derived the term from the Greek hormone, meaning "to excite or set in motion". The term "endocrine" was introduced shortly thereafter. "Endocrine" is used to refer to glands that secrete products into the bloodstream. The term "endocrine" contrasts with "exocrine", which is applied to glands that secrete their products though ducts to the site of action. Examples of exocrine glands are the tear glands, the sweat glands, and the pancreas, which secrete pancreatic juice through a duct into the intestine. Exocrine glands are also called duct glands, while endocrine glands are called ductless glands. [br] What is the author’s main purpose in the passage? ______
选项
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.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3298312.html
相关试题推荐
Innovationcancomefromwithoutaswellaswithin.Appleiswidelyassumed
Islanguage,likefood,abasichumanneedwithoutwhichachildatacritica
Islanguage,likefood,abasichumanneedwithoutwhichachildatacritica
Islanguage,likefood,abasichumanneedwithoutwhichachildatacritica
Theregularuseoftextmessagesande-mailscanlowertheIQmorethantwic
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Rhythminliteratureisamoreorlessregularoccurrenceof
[originaltext]Rhythminliteratureisamoreorlessregularoccurrenceof
Withoutregularsuppliesofsomehormonesourcapacitytobehavewouldbese
Withoutregularsuppliesofsomehormonesourcapacitytobehavewouldbese
随机试题
StudentlifeatAmericanuniversitiesischaoticduringthefirstweekofea
Conversationbeginsalmostthemomentwecomeintocontactwithanotherand
Withincreasingawarenessoftheenvironment,peoplehaverealizedthatthewayc
[originaltext]W:George,lookatthelongwaitingline.I’mgladyouhavemade
在餐饮生产控制中,针对餐饮生产的某个阶段或环节容易出现的质量问题进行专门的督导管
下列各项可以取得集体土地使用权的有( )。A.乡里的公路建设需要使用村中土地
经常项目是最具综合性的对外贸易指标。( )
甲状腺功能亢进症
在办理个人消费额度贷款时,借款人要向银行提供银行认可的()。A.信用资格 B
关于租赁合同的说法,正确的是()。A.租赁合同的最长租赁期限,法律没有限制
最新回复
(
0
)