BIO 100 2.3 Cellular Respiration PowerPoint.ppt - Cellular Respiration Respiration • Think of breathing e.g in emergency room “check respiration.”

BIO 100 2.3 Cellular Respiration PowerPoint.ppt - Cellular...

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Cellular Cellular Respiration Respiration
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Respiration Think of breathing, e.g., in emergency room “check respiration.” Respiration in this context is ventilation of lungs. Cellular respiration is quite different, but related to breathing. At the end of this lecture, you should be able to answer the question, “why do we breathe?”
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Before we go on . . . Richard Leakey, son of Louis and Mary Leakey, famous paleoanthropologists that discovered some early human fossils. He was raised in the African bush. He made a rash (?) bet in a smoky bar in Nairobi, Kenya that he could capture a gazelle, among the fleetest of African ungulates, without using weapons, tools or vehicles. Results of bet revealed later after you learn about cellular respiration, and can appreciate what happened.
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Smoky Bar Smoky Bar No Relation
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Gazelle Yes, I am as fast as I look.
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I have posted photos of a variety of organisms for you to view. The purpose is to consider what they all have in common. All are made of cells, all use cell transport, and all use cellular respiration to stay alive by providing energy to power those cells.
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Coyote
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King Snake
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Boletes Boletes
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Elodea
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Okapi
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Vermillion Fly Catcher
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Viper Fish
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Natural Bonsai: Pine Tree
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Peregrine Falcon
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These organisms (and all others) are similar in the way their cells harvest energy from food. The commonality of cellular respiration pathways is strong evidence of the relatedness of life on Earth.
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Metabolism Defined as the sum of all chemical reactions in living organisms. Cellular respiration is a subset of metabolism.
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Metabolism 66 Pathways and 2800+ Reactions
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Two Branches of Metabolism 1.Catabolism Energy releasing pathways that break down nutrient molecules (stepwise release of energy). Provides the energy needed to drive the (energy requiring) anabolic reactions of growth, maintenance, reproduction, and other forms of cellular work such as movement. 2. Anabolism Energy requiring pathways that synthesize molecules. Provides for growth and repair. To remember the terms think of anabolic steroids.
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Energy may be released in two major ways: 1) Explosive release, in which much of the energy is simultaneously released, typically preventing such energy from being used to do productive work. Think of a can of gasoline exploding. 2) Step-wise release, in which small amounts of energy are incrementally released and harnessed to do useful work. Think of gasoline in an engine, doing useful work.
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