Comprehensive Guide to Human Metabolism and Metabolic Pathways
1. Glycolysis
- Location: Cytosol
- Oxidizing agent: NAD+, which is reduced to NADH
Steps:
- Glucose is converted to Glucose-6-Phosphate (G-6-P) by Hexokinase, consuming ATP (ATP → ADP).
- G-6-P is converted to Fructose-6-Phosphate (F-6-P) by Phosphoglucoisomerase.
- F-6-P is converted to Fructose-1,6-Bisphosphate (F-1,6-BP) by Phosphofructokinase, consuming ATP (ATP → ADP).
- F-1,6-BP is cleaved by Aldolase into two products: Glyceraldehyde-3-Phosphate and Dihydroxyacetone Phosphate (DHAP).
- DHAP is converted to
Matter and Energy Flow in the Biosphere: Understanding Trophic Levels and Biogeochemical Cycles
Item 4: Matter and Energy Flow in the Biosphere
Key Terms
Biosphere: The set of all living things that inhabit the Earth.
Ecosystem: A natural system consisting of living and nonliving components that interact with each other.
Ecosphere: The set of all ecosystems constituting Earth. In other words, the ecosphere is the grand ecosystem.
Biomes: The different ecosystems on Earth.
Trophic Relationships
Trophic relationships represent the energetic mechanisms of energy transfer within an ecosystem. They are
Read MoreA Comprehensive Guide to Child Nutrition and Feeding
Food vs. Nutrition
Food
Food is the way we provide our bodies with the necessary nutrients. It is a voluntary and conscious act that directly affects human health. Food habits vary according to geographic and cultural mores, economic status, and personal preferences.
Nutrition
Nutrition encompasses the series of processes by which the body uses, harnesses, and transforms the substances it receives from food to reach their full utilization. It is an involuntary and unconscious act.
Nutrients and Energy
The
Read MoreMetabolism: Concepts, Pathways, and Regulation
Concept of Metabolism
Metabolism encompasses all chemical reactions occurring within living cells, providing energy and synthesizing new organic material. It involves both the breakdown (catabolism) and synthesis (anabolism) of biomolecules.
Anabolic and Catabolic Pathways
Anabolic pathways require energy to synthesize complex molecules from simpler ones, such as synthesizing sugar from CO2 or proteins from amino acids. These processes are essential for cell growth and require energy from ATP and other
Read MoreThe Circulatory and Respiratory Systems: A Comprehensive Guide
The Circulatory System
Diastole
The musculature of the walls of the heart relaxes, allowing blood from the arteries to flow into the ventricles.
Heartbeat
Each heartbeat consists of several phenomena that constitute a cardiac cycle.
Atrial Systole
The atria contract and push blood into the ventricles.
Ventricular Systole
The ventricles contract, forcing blood out through the arteries and opening the pulmonary and aortic valves.
Varicose Veins
These are abnormal dilatations of veins that are visible to the
Read MoreInsect Physiology: A Comprehensive Guide to Internal Systems
Insect Physiology
Digestive System
Structure
A tube of epithelial cells, with the foregut and hindgut lined with cuticle that must be molted.
Segments
- Foregut
- Midgut
- Hindgut
Digestion
The breakdown and absorption of chemical energy and the elimination of waste.
Dietary Necessities
- Chemical energy
- Protein
- Fats and Lipids
- Essential vitamins
- Minerals
- Water
Foregut
Ingestion, initial digestion, and storage. Consists of the mouth, esophagus, salivary glands, crop, and proventriculus.
Crop
Food storage.
Proventriculus
Modifications
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