Lecture 18 - BIOL104-04 Principles of Biology I October 6,...

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BIOL104-04 Principles of Biology I October 6, 2010 Lecture #18 Ch 43.6 - Ch 43.8
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Metabolic pathways in green plants • Autotrophs • Can synthesize all the molecules they need from simple starting materials – CO2 – H2O – Phosphate, sulfate & ammonium ions • Photosynthesis produces carbohydrates that the plant uses to provide energy for – Active transport – Synthesis of macromolecules
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• Both photosynthesis & cellular respiration can occur in plant cells • Glycolysis • Cellular respiration • Photosynthesis • All 3 processes can occur simultaneously Metabolic pathways in green plants
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Levels of organization Tightly regulated Not independent
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Functional grouping of organ systems • Communication & integration • Support & movement • Regulation & maintenance • Defense • Reproduction & development
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Communication & Integration
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Support & movement
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Regulation & maintenance
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Defense
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Reproductive system
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Homeostasis • Keeping stable chemical & physical conditions in cells, tissues & organs • Internal conditions may change with the environment but chemical & physical states kept within tolerable range • Animals have regulatory systems to maintain homeostasis • Set point = normal or target value for the controlled variable (pH, O 2 , temp)
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Homeostatic mechanisms maintain stable internal conditions
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 18 - BIOL104-04 Principles of Biology I October 6,...

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