The vector stencils library "Citric acid cycle (TCA cycle)" contains 26 symbols of metabolites for drawing metabolic pathway maps and biochemical shematic diagrams of the citric acid cycle (TCA cycle,  tricarboxylic acid cycle, Krebs cycle) and diagrams of metabolism processes. 
"The citric acid cycle - also known as the tricarboxylic acid cycle (TCA cycle), or the Krebs cycle, - is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of adenosine triphosphate (ATP). In addition, the cycle provides precursors of certain amino acids as well as the reducing agent NADH that is used in numerous other biochemical reactions. Its central importance to many biochemical pathways suggests that it was one of the earliest established components of cellular metabolism and may have originated abiogenically.
The name of this metabolic pathway is derived from citric acid (a type of tricarboxylic acid) that is consumed and then regenerated by this sequence of reactions to complete the cycle. In addition, the cycle consumes acetate (in the form of acetyl-CoA) and water, reduces NAD+ to NADH, and produces carbon dioxide as a waste byproduct. The NADH generated by the TCA cycle is fed into the oxidative phosphorylation (electron transport) pathway. The net result of these two closely linked pathways is the oxidation of nutrients to produce usable chemical energy in the form of ATP." [Citric acid cycle. Wikipedia]
The shapes example "Design elements - TCA cycle" is included in the Biology solution from the Science and Education area of ConceptDraw Solution Park.
                        
                                                
                    "The citric acid cycle - also known as the tricarboxylic acid cycle (TCA cycle), or the Krebs cycle, - is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of adenosine triphosphate (ATP). In addition, the cycle provides precursors of certain amino acids as well as the reducing agent NADH that is used in numerous other biochemical reactions. Its central importance to many biochemical pathways suggests that it was one of the earliest established components of cellular metabolism and may have originated abiogenically.
The name of this metabolic pathway is derived from citric acid (a type of tricarboxylic acid) that is consumed and then regenerated by this sequence of reactions to complete the cycle. In addition, the cycle consumes acetate (in the form of acetyl-CoA) and water, reduces NAD+ to NADH, and produces carbon dioxide as a waste byproduct. The NADH generated by the TCA cycle is fed into the oxidative phosphorylation (electron transport) pathway. The net result of these two closely linked pathways is the oxidation of nutrients to produce usable chemical energy in the form of ATP." [Citric acid cycle. Wikipedia]
The shapes example "Design elements - TCA cycle" is included in the Biology solution from the Science and Education area of ConceptDraw Solution Park.
Biology Drawing Software
Biology is incredibly interesting and useful natural science which studies all living things on the earth (people, animals, plants), structure, functions, interactions, evolution of living organisms. Biologists of the whole world use actively illustrations and drawings in your science and education activity. To facilitate their task of biology drawing, ConceptDraw PRO diagramming and vector drawing software was extended with Biology solution from the Science and Education area. Now, ConceptDraw PRO is a powerful biology drawing software."Citric acid cycle (tricarboxylic acid cycle, TCA cycle, Krebs cycle) is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of adenosine triphosphate (ATP)." [Citric acid cycle. Wikipedia] 
This biochemical diagram example shows metabolic pathways map of citric acid cycle reactions.
This sample was redesigned from the Wikimedia Commons file: TCA cycle.svg. [commons.wikimedia.org/ wiki/ File:TCA_ cycle.svg]
This image is licensed under the Creative Commons Attribution 3.0 Unported license. [creativecommons.org/ licenses/ by/ 3.0/ deed.en]
The metabolic pathway map example "Citric acid cycle (TCA cycle)" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Biology solution from the Science and Education area of ConceptDraw Solution Park.
                        
                                                
                    This biochemical diagram example shows metabolic pathways map of citric acid cycle reactions.
This sample was redesigned from the Wikimedia Commons file: TCA cycle.svg. [commons.wikimedia.org/ wiki/ File:TCA_ cycle.svg]
This image is licensed under the Creative Commons Attribution 3.0 Unported license. [creativecommons.org/ licenses/ by/ 3.0/ deed.en]
The metabolic pathway map example "Citric acid cycle (TCA cycle)" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Biology solution from the Science and Education area of ConceptDraw Solution Park.
Biology Symbols
ConceptDraw PRO diagramming and vector drawing software extended with Biology solution from the Science and Education area offers a set of useful tools for fast and easy drawing of various biology illustrations and drawings.Biology solution provides 3 libraries with large quantity of vector biology symbols: Biochemistry of Metabolism Library, Carbohydrate Metabolism Library, Citric Acid Cycle (TCA Cycle) Library.
                        
                            
                                 Biology
                                Biology                            
                                                    
                        
                        
                        
                            Biology solution extends ConceptDraw PRO software with samples, templates and libraries containing biological vector symbols, to help you create scientific and educational designs in the field of biology.                        
                    Biology Illustration
Biology solution offers 3 libraries of ready-to-use predesigned biology symbols and vector clipart to make your biology drawing and biology illustration making fast and easy: Carbohydrate Metabolism Library, Biochemistry of Metabolism Library, Citric Acid Cycle (TCA Cycle) Library."In biochemistry, metabolic pathways are series of chemical reactions occurring within a cell. In each pathway, a principal chemical is modified by a series of chemical reactions. Enzymes catalyze these reactions, and often require dietary minerals, vitamins, and other cofactors in order to function properly. Because of the many chemicals (a.k.a. "metabolites") that may be involved, metabolic pathways can be quite elaborate. In addition, numerous distinct pathways co-exist within a cell. This collection of pathways is called the metabolic network. Pathways are important to the maintenance of homeostasis within an organism. Catabolic (break-down) and Anabolic (synthesis) pathways often work interdependently to create new biomolecules as the final end-products."  [Metabolic pathway. Wikipedia] 
The biochemical diagram example "Metabolic pathway map" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Biology solution from the Science and Education area of ConceptDraw Solution Park.
                        
                                                
                    The biochemical diagram example "Metabolic pathway map" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Biology solution from the Science and Education area of ConceptDraw Solution Park.
This biochemical chart display how proteins, polysaccharides and fats from food are digested into gastrointestinal tract into aminoacids, monosaccharides and fatty acids, and then broken down and oxidized to carbon dioxide and water in cellular processes of energy generation. 
This metabolic pathway map was redesigned from Wikipedia file: Catabolism schematic.svg. [en.wikipedia.org/ wiki/ File:Catabolism_ schematic.svg]
The biochemical diagram example "Catabolism schematic" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Biology solution from the Science and Education area of ConceptDraw Solution Park.
                        
                                                
                    This metabolic pathway map was redesigned from Wikipedia file: Catabolism schematic.svg. [en.wikipedia.org/ wiki/ File:Catabolism_ schematic.svg]
The biochemical diagram example "Catabolism schematic" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Biology solution from the Science and Education area of ConceptDraw Solution Park.
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