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
45
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
Theworksofthisbrilliantcomposerarebeyondcriticism.A、这位才华横溢的作曲家的作品是无可指责的。
SpeakerA:CanIdoanythingforyou?SpeakerB:________A、No.Youcan’tdoanyth
Wemustrespectother’s______,butnotmakeaninvasionofit.A、privacyB、human
初孕妇,27岁。妊娠33周,头痛6日就诊。查血压180/120mmHg,脉搏96
急性假膜型念珠菌口炎多发于A.老年人 B.新生婴儿 C.40岁左右的中年人
患儿,男,7岁。睡中遗尿,白天小便频而量少,劳累后遗尿加重,面白气短,食欲不振,
患者,65岁,老年性痴呆5年。生活能力下降,自己扣纽扣、系鞋带慢慢出现困难,分不
There’snodoubtthatnanotechnologypro
在工程建设项目招标投标过程中,投标人提交的投标保证金可以是()。A.银行保函
男性,43岁,呕吐、腹泻2天,意识模糊、烦躁不安半天急诊入院。查体:BP110/
最新回复
(
0
)