Homeostasis

Homeostasis - Homeostasis & Organization Chapter 31...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Homeostasis & Organization Chapter 31 Outline Homeostasis: How Do Animals Regulate Their Internal Environment? p. 636 How Is the Animal Body Organized? p. 639
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Section 31.1 Outline Homeostasis: How Do Animals Regulate Their Internal Environment? The Internal Environment is Maintained in a State of Dynamic Constancy Animals May be Categorized by How They Regulate Body Temperature Feedback Systems Regulate Internal Conditions The Body’s Internal Systems Act in Concert
Background image of page 2
Dynamic Constancy The cells of the animal body cannot survive if the internal environment deviates from a narrow range of acceptable states Homeostasis refers to the constancy of the body’s internal environment
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dynamic Constancy Although the word homeostasis implies a static, unchanging state, the internal environment is actually in a state of dynamic constancy The body actively adjusts to ongoing internal and external changes to maintain constant conditions
Background image of page 4
Dynamic Constancy Homeostatic mechanisms regulate a variety of conditions in the fluids surrounding cells Temperature Water and salt levels Glucose pH Oxygen and carbon dioxide
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dynamic Constancy Constancy of these conditions is required for Neuronal activity Muscle contraction Optimal enzyme activity for all metabolic reactions
Background image of page 6
Body Temperature Regulation Animals are grouped according to source of body warmth Endotherms Ectotherms
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Body Temperature Regulation Endotherms generate body heat through metabolic reactions Maintain constant body temperature Birds, mammals
Background image of page 8
Body Temperature Regulation Ectotherms derive body heat from environment Maintain heat by occupying a constant environment or behaviorally, e.g. basking in sun Reptiles, amphibians, fishes, invertebrates
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Feedback Systems Homeostatic mechanisms that maintain internal constancy are collectively known as feedback systems
Background image of page 10
Feedback Systems There are three parts to feedback systems Control center (with set point) Sensor Effector
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 44

Homeostasis - Homeostasis & Organization Chapter 31...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online