big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment
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Big Idea 2.D: Growth and dynamic homeostasis are influenced by changes in the environment

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Homeostasis in a Changing Environment. Big Idea 2.D: Growth and dynamic homeostasis are influenced by changes in the environment. Essential Knowledge.

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Presentation Transcript
essential knowledge
Essential Knowledge
  • 2D1: All biological systems from cells to organisms to populations, communities, and ecosystems are affected by complex biotic and abiotic interactions involving exchange of matter and free energy.
  • 2D2: Homeostatic mechanisms reflect both common ancestry and divergence due to adaptation in different environments.
  • 2D3: Biological systems are affected by disruptions to their dynamic homeostasis.
slide4
External Environment

Made up of Biotic Things: Living

slide5

External Environment

And Abiotic Things: Not Living

slide6

TPS: With your partner, make a list of 4 other biotic and 4 other abiotic factors that may affect organisms in an environment.

case study biofilms
Case Study: Biofilms
  • Bacterial cells attach to each other to form biofilms (a protective protein matrix cover)
  • Communal group for protection and shared nutrients
  • Grow with limited nutrients.
organisms interact with biotic abiotic factors
Organisms Interact with Biotic/Abiotic Factors
  • Organisms access to nutrients is affected by other factors
  • i.e. symbiosis, predator-prey, nutrient availability etc
interactions among organisms
Interactions Among Organisms
  • Symbiosis: relationship b/t 2 species
  • Mutualism (+,+)
  • Commensalism (+,0)
  • Parasitism (+,-)
mutualism
Mutualism
  • Both Species Benefit
  • Rhinos and oxpeckers
commensalism
Commensalism
  • One member is helped, the other neither benefits or is harmed
  • Cows and Cattle Egrets
parasitism
Parasitism
  • + and - relationship
  • parasite benefits, host loses
  • parasite usually smaller than host

Leech Bite, Thailand

Lamprey

evolution of homeostatic mechanisms
Evolution of Homeostatic Mechanisms
  • Some mechanisms are conserved- showing common ancestry
  • Others have changed, demonstrating divergent evolution (due to changing envs)
case study nitrogenous waste removal
Case Study: Nitrogenous Waste Removal
  • All animals produce N byproducts
  • Animals in diff. envs. have evolved different mechanisms for excreting these wastes
ammonia nh 3
Ammonia, NH3
  • Toxic byproduct of protein degradation
  • In dilute concentrations is no big deal, so aquatic orgs can excrete it into water
slide20
Urea
  • Mammals convert NH3 into urea  travels through blood to kidneys and is excreted w/ water and other substances as urine
solid uric acid
Solid Uric Acid
  • In birds and reptiles (and some desert mammals) N waste is excreted as a solid
  • Prevents H2O loss and buildup of H2O waste in shell of an egg
disruptions at the molecular cellular level affect organisms homeostasis
Disruptions at the Molecular/Cellular Level Affect Organisms Homeostasis
  • Exs: viral infection of a cell, allergies, or dehydration in Willis’s body ;)
disruptions to ecosystems affect homeostasis
Disruptions to Ecosystems Affect Homeostasis
  • Exs: food chain disruptions, natural disasters, salination (adding salt)
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