U3.02 - Chemical messengers (p).pdf - U3.02 (*) Cell-com...

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[U3.02](*)Cell-com systems in your body(a)Types of hormones(b)Lord of the glands :: hypothalamus(c)All the other glands[U3.09](d)Failure and disruption to endocrine systemEndocrine systemFor the sake of homeostasisxrhombusHomeostasissquare4Body’s ability tomaintainaconstant internal environment,despite changesininternal / external environmentsquare4Body’s ability todetect stimulusandrespondreturnbody tooptimum conditions[seeU3.06-08, Homeostasis & regulation]square4Utilisesstimulus-response model, whereby organscommunicatewith one another usingsquare4Endocrine systemsquare4Nervous system[seeU3.03-05, Nervous system :: PNS & CNS]U3.02(*)Cell-com systems in your body(a)(b)(c)::U3.09(d)[pg. 22]Disassembling G.E.O.R.G.E.xrhombusStimulus-response modelsquare4Stimulus=changeininternal / externalenvironmentsquare4Detected byreceptorcells / organ;detect inc / decreasesquare4Message tomodulator/ control center; processes message,makes decision on what & how to respondsquare4Message toeffectorcells / organ (eg.gland or muscle)square4Response= response thatcancels original stimulusU3.02(*)Cell-com systems in your body(a)(b)(c)::U3.09(d)[pg. 22]Reconstructing G.E.O.R.G.E.xrhombusStimulus-response modelxrhombus[negative feedbackreduces / negates / eliminates the original stimulus,ie. response that decreases original stimulus, reverses the change]xrhombus[negative feedback is needed tomaintain opt. conditions;body conditions fluctuate, but iskept in dynamic equilibrium]U3.02(*)Cell-com systems in your body(a)(b)(c)::U3.09(d)[pg. 22]Optimum levelStimulusChangeininternal /externalenvironmentResponseResponse thatcancelsstimulusReceptorReceptor cell /organdetectchangeModulatorProcessmessage;senddecisiontoeffectorEffector(eg.gland ormuscle)Carry outdecision
Cell-com vs. CelcomxrhombusCommunicationbetween organsU3.02(*)Cell-com systems in your body(a)(b)(c)::U3.09(d)[pg. 22, 55-56]*Endocrine systemNervous systemSends outHormoneAction PotentialNature of transmissionChemicalNeurochemicalTravel viaBlood vessels / bloodNerves / neuronsSpeed of transmissionSlow acting(in s - days)Fast acting (in ms)SpecificitySpecific(eachhormonebinds toonly its target cells)Specific(each neuron attaches toonly its gland / muscle)Spread of actionWidespread(target cellsmay be inmany parts of the body)Localised(gland / muscle in only onearea)Persistence of actionLong-termShort-termGet to know your glands >_<xrhombusTypes of glandssquare4Endocrine system, made of many2endocrine glandssquare4Glands without ducts,produce & secretehormones directlyinto theextracellular fluid / bloodsquare4Hormones travel via blood totarget cells, induceactionU3.02(*)(a)Types of hormones(b)(c)::U3.09(d)[pg. 22]*Endocrine glandsExocrine glandsDescriptionGland without ductsGland with ductsProducesHormonesonlySecretions w nut. / enz.

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Term
Fall
Professor
N/A
Tags
Endocrine System, Cortisol, Mammary Gland

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