Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment
This presentation is the property of its rightful owner.
Sponsored Links
1 / 25

Big Idea 2.D: Growth and dynamic homeostasis are influenced by changes in the environment PowerPoint PPT Presentation


  • 45 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

Homeostasis in a Changing Environment

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


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.


Organisms respond to external environments

Organisms Respond to External Environments

What was this called???


Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

External Environment

Made up of Biotic Things: Living


Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

External Environment

And Abiotic Things: Not Living


Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

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.


Cells interact with biotic abiotic factors

Cells Interact with Biotic/Abiotic Factors


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


Ecosystems stability is based upon interactions w biotic or abiotic factors

Ecosystems’ Stability is based upon interactions w/ biotic or abiotic factors


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


Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

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


Evolution of circulatory system shows common ancestry and divergence

Evolution of Circulatory System Shows Common Ancestry and Divergence


Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

Evolution of Circulatory System Shows Common Ancestry and Divergence


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)


  • Login