Control Of Homeostasis/feedback Systems

Front 1

action potentials

Back 1

electrical signals-nerve impulses sent by nervous system to regulate homeostasis

Front 2

hormones

Back 2

messenger molecules secreted by the endocrine system

Front 3

feedback system/feedback loop

Back 3

a cycle of events in which the status of a body condition is monitored, evaluated, changed, remonitored, reevaluated, and so on--contains 3 basic components: receptor, control center, effector

Front 4

controlled condition

Back 4

each monitored variable in feedback system

Front 5

stimulus

Back 5

any disruption that changes a controlled condition

Front 6

receptor

Back 6

body structure that monitors changes in a controlled condition & sends input to a control center (nerve impulses or chemical signals

Front 7

control center

Back 7

sets the range of values within which a controlled condition should be maintained, evaluates the input it receives from receptors, and generates output commands (nerve impulses, horomones or other chemical signals),when they are needed--brain

Front 8

effector

Back 8

a body structure that receives output from the control center and produces a response or effect that changes the controlled condition

Front 9

negative feedback system

Back 9

reverses a change in a controlled condition; activity of the effector causes a result that negates the original stimulus; ex: increased blood pressure

Front 10

positive feedback system

Back 10

tends to strengthen or reinforce a change in one of the body's controlled conditions; the effector produces a physiological response that adds to or reinforces the initial change in the controlled condition; ex: childbirth --needs some event outside the system to shut it off

Front 11

disorder

Back 11

any abnormality of structure or function

Front 12

disease

Back 12

a more specific term for an illness characterized by a recognizable set of signs and symptoms

Front 13

local disease

Back 13

affects one part or a limited region of the body

Front 14

systemic disease

Back 14

affects either the entire body or several parts

Front 15

symptoms

Back 15

subjective changes in body functions that are not apparent to an observer; ex: headache, nausea, anxiety

Front 16

signs

Back 16

objective changes that a clinician can observe and measure; ex: swelling, rash, fever

Front 17

epidemiology

Back 17

the science that deals with why, when, and where diseases occur and how they are transmitted among individuals in a community

Front 18

pharmacology

Back 18

the science that deals with the effects and uses of drugs in the treatment of disease