24. Regulation of Carbohydrate Metabolism and Blood Glucose Levels
Covers how blood glucose is held steady across the liver, muscle, adipose tissue and pancreas, with the roles of insulin and glucagon. It then explains the Cori cycle for recycling lactate and summarises how PFK-1, PEPCK, FBPase, glycogen synthase and phosphorylase are controlled by hormones such as insulin, glucagon, cortisol and epinephrine. Four multiple-choice questions with answers close the note.
Topic 24 of 70 in the MU Sofia syllabus for Biochemistry (Medicine, Year 2). The free AceMed note covers it in 8 sections, about 622 words (4 min of reading), with 10 flashcards.
In this note
Regulation of Carbohydrate Metabolism and Blood Glucose Levels:
Glucose Homeostasis:
Role of Different Tissues and Organs:
The Cori Cycle:
Regulatory Enzymes and Hormones:
Conclusion
MCQs ☺
Answers
Glucose Homeostasis:
The body tightly regulates blood glucose levels to ensure a constant supply of energy for cellular functions.
Glucose homeostasis involves a balance between glucose uptake from the diet, glucose production via gluconeogenesis, and glucose utilization in tissues.
Role of Different Tissues and Organs:
Liver:
The liver plays a central role in glucose homeostasis, acting as a glucose buffer.
It stores excess glucose as glycogen during periods of high blood glucose (postprandial state) and releases glucose into the bloodstream when needed (fasting state).
Additionally, the liver is involved in gluconeogenesis, the synthesis of glucose from non-carbohydrate precursors such as lactate, glycerol, and amino acids.
Muscle:
Muscle tissue can store glucose in the form of glycogen for its own energy needs.
During exercise or periods of high energy demand, muscle glycogen is broken down to provide glucose for glycolysis and ATP production.
Role of Different Tissues and Organs:
Adipose Tissue:
Adipose tissue stores excess energy in the form of triglycerides.
It can also release glycerol, a precursor for gluconeogenesis, and free fatty acids, which can be used as an alternative energy source during prolonged fasting.
Pancreas:
The pancreas secretes insulin and glucagon, two hormones that regulate blood glucose levels.
Insulin promotes glucose uptake by cells, glycogen synthesis, and lipogenesis, leading to a decrease in blood glucose levels.
Glucagon stimulates glycogenolysis and gluconeogenesis in the liver, increasing blood glucose levels.
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