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Related Concept Videos

Biosynthesis of Polysaccharides01:26

Biosynthesis of Polysaccharides

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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Metabolic States of the Body: Fasting and Starvation01:24

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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

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The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
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Dietary Connections01:23

Dietary Connections

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In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used...
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Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

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Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
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Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
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Related Experiment Video

Updated: Jan 18, 2026

A Modified Co-Culture System for Understanding Granulosa-Theca Cell Interactions in the Bovine Ovary
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Published on: September 19, 2025

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Gluconeogenesis in cattle: significance and methodology.

J W Young

    Journal of Dairy Science
    |January 1, 1977
    PubMed
    Summary

    Ruminant gluconeogenesis is vital as dietary carbs ferment in the rumen. Propionate is the key precursor, and various isotope dilution techniques measure its conversion to glucose, though further research is needed.

    Area of Science:

    • Animal Physiology
    • Metabolic Biochemistry

    Background:

    • Gluconeogenesis is crucial in ruminants due to extensive rumen fermentation of dietary carbohydrates.
    • Propionate is the primary volatile fatty acid precursor for gluconeogenesis in ruminants.

    Purpose of the Study:

    • To review techniques for studying ruminant gluconeogenesis.
    • To highlight methods for measuring glucose kinetics and precursor contributions.

    Main Methods:

    • Isotope dilution techniques (single-injection or continuous-infusion) for glucose kinetics.
    • Measurement of gut glucose absorption using arterial-venous differences and portal blood flow.
    • Isotope dilution for propionate production and [carbon-14]propionate tracing for conversion to glucose.
    • In vitro studies of gluconeogenic enzymes and preparations, validated by in vivo experiments.

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    Main Results:

    • Various methods exist to quantify glucose kinetics, absorption, and precursor utilization in ruminants.
    • Accurate quantification requires careful correction for label recycling and metabolic pathways (e.g., citric acid cycle).
    • In vitro studies offer insights but require in vivo validation.

    Conclusions:

    • Significant progress has been made in understanding ruminant gluconeogenesis.
    • Further research is essential for a comprehensive understanding of ruminant gluconeogenesis and its regulation.