HUBS1403 Lecture Notes - Lecture 1: Concept Map, Negative Feedback, Positive Feedback
18 May 2018
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Lecture'1'–'Homeostasis'
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1. What!are!the!levels!of!structural!organisation?!
Chemical!!!cellular!!!tissue!!!organ!!!system!!!organismal!
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2. What!is!homeostasis!and!how!is!it!maintained?!
Homeostasis!is!the!ability!to!maintain!an!organism’s!parameters!within!a!normal!range!of!values.!It!is!
maintained!by!feedback!systems.!
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3. Which!two!body!systems!are!involved!in!homeostatic!regulation!and!how!do!they!act?!
The!nervous!system!and!endocrine!system!are!involved!in!homeostatic!regulation!and!work!together!or!
independently.!
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4. What!are!the!two!feedback!systems?!
Negative!feedback!–!reverses!the!effect!of!a!stimulus!
Positive!feedback!–!amplifies!the!effect!of!a!stimulus!
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5. Give!an!example!of!negative!feedback!ad!complete!the!concept!map.!
Homeostasis!!!temperature!drop!!!thermoreceptors!in!skin!!!brain!!!hair!raising/shivering!!!
homeostasis!
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6. Give!an!example!of!positive!feedback!and!complete!the!concept!map.!
Baby!head!pushes!against!cervix!!!nerve!impulses!from!cervix!to!brain!!!brain!stimulates!pituitary!
gland!to!secrete!oxytocin!!!oxytocin!carried!in!bloodstream!!!oxytocin!stimulates!uterine!contractions!
!!baby!head!pushes!against!cervix!
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7. What!are!the!consequences!of!homeostatic!failure?!
Disease!and!death!
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