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
2025-01-14
11
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/3912872.html
相关试题推荐
Islanguage,likefood,abasichumanneedwithoutwhichachildatacritica
Islanguage,likefood,abasichumanneedwithoutwhichachildatacritica
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Whydowecry?Canyouimaginelifewithouttears?Notonlyd
[originaltext]Rhythminliteratureisamoreorlessregularoccurrenceof
[originaltext]Rhythminliteratureisamoreorlessregularoccurrenceof
Withoutregularsuppliesofsomehormonesourcapacitytobehavewouldbese
Withoutregularsuppliesofsomehormonesourcapacitytobehavewouldbese
Withoutregularsuppliesofsomehormonesourcapacitytobehavewouldbese
随机试题
Therearemorethan300millionofusintheUnitedStates,andsometimesit
[originaltext]W:Gosh,Fred,anothercupofcoffee?That’syourthirdsincelun
南宋山水画《踏歌图》的作者是()。A.李唐 B.刘松年 C.夏圭 D.马远
女性,28岁,风湿性瓣膜病病史2年。3周前因感冒出现呼吸困难,咳嗽,不能平卧。查
A.水杨酸 B.对乙酰氨基酚 C.心痛定 D.速尿 E.氟美松硝苯地平又
佛教“三藏”不包括( )A.经 B.律 C.法 D.论
根据《企业破产法》的规定,人民法院决定受理破产申请后,应自裁定受理破产申请之日起
某建设项目开标后,评标委员会发现某投标人的工程量清单中,总价金额和单价与工程量乘
按工程可研方案,新增的冷却塔噪声会导致相邻居住区噪声超标,可优先考虑的噪声防治措
下列说法正确的是A.发病率和患病率是一样的 B.现患率和患病率是不一样的 C
最新回复
(
0
)