Cellular Processes and structure 04 Homeostasis Exchange of energy/matter Homeostatic mechanisms Defense against infection

Homeostasis Curriculum Framework: 2.D.1-2 Holtzclaw: 224-228 (not everything, I’ll keep looking)

Organisms have various methods to maintain homeostasis Reflect evolutionary history animals and fungi share many mechanisms at the cellular level Some stressors are universal ex. aquaporins ex. oxidative stress But the response can differ from one species to the next. Bacterial aquaporins differ from those of animals Bacteria and plants produce different antioxidants for the same oxidative stress

Various mechanisms for obtaining nutrients and eliminating wastes Example Digestive mechanisms: food vacuoles gastrovascular cavities one-way digestive systems

mechanisms for obtaining nutrients and eliminating wastes (cont.) What mechanisms do plants have for obtaining nutrients and eliminating waste?

Homeostatic mechanisms of microbes, plants and animals support common ancestry Example:

Disruptions to homeostasis Lesson 3

Disruptions at the molecular and cellular level Ex. Your cells produce catalase in response to hydrogen peroxide This is true of all known organisms How do you think bacteria respond to a lack of water?

Disruption of ecosystems Invasive and/or eruptive species Human impact Hurricanes, floods, earthquakes, volcanoes, fies Water limitation Salination