Category: Lab Notes

Biochemistry is the study of the chemical substances, structures, and reactions of living organisms. Explore biomolecules, proteins, enzymes, metabolism, bioenergetics, nucleic acids, biochemical pathways, molecular regulation, and applications of biochemistry in health and life science.

Physiology is the branch of biology that studies how living organisms and their parts function. Explore cellular, molecular, human, animal, plant, comparative, exercise, environmental, and clinical physiology, along with homeostasis, regulation, adaptation, and physiological processes.

Anatomy is the branch of biology that studies the structure of organisms and the relationships among their parts. Explore gross, microscopic, regional, systemic, comparative, developmental, clinical, and human anatomy, along with anatomical terminology, imaging, and the relationship between structure and function.

Zoology is the branch of biology that studies animals, including their diversity, anatomy, physiology, behavior, genetics, evolution, classification, ecology, and conservation.

Botany is the study of plants, covering their structure, physiology, reproduction, genetics, evolution, classification, ecology, conservation, and importance to life on Earth.

Ecology is the study of interactions between organisms and their environment. Explore populations, communities, ecosystems, biodiversity, energy flow, nutrient cycles, biomes, conservation, and global environmental change.

Genetics is the study of genes, heredity, DNA, genetic variation, and inheritance. Learn how genetic information is stored, expressed, transmitted, and changed, and how genetics connects with evolution, health, disease, genomics, and biotechnology.

Cell biology is the study of cells, their structures, functions, interactions, and processes. Learn about cell types, organelles, membranes, metabolism, cell division, signaling, differentiation, and other fundamental cellular processes.

Science is a systematic way of understanding the world through observation, evidence, experimentation, reasoning, and research. Explore the major branches of science, including natural science, social science, formal science, applied science, and interdisciplinary fields.

Biology is the scientific study of life and living organisms. Learn about the major branches of biology, including cell biology, genetics, evolution, ecology, microbiology, human biology, biotechnology, and more.

Glycogen metabolism is the coordinated process through which glucose is stored as glycogen and released when energy or glucose is required. Glycogenesis produces glycogen during periods of nutrient availability, while glycogenolysis mobilizes stored glucose during fasting, exercise, and increased energy demand. The liver uses glycogen mainly to support blood glucose homeostasis, whereas skeletal muscle glycogen provides fuel for muscle activity. Insulin, glucagon, epinephrine, cellular energy status, and metabolic signaling pathways regulate these processes.

Energy metabolism allows cells to convert carbohydrates, fats, and proteins into usable energy. Explore ATP production, glycolysis, the citric acid cycle, oxidative phosphorylation, fatty acid oxidation, glycogen metabolism, amino acid metabolism, mitochondria, insulin signaling, AMPK, and metabolic flexibility.

Hyperinsulinemia is a condition characterized by elevated circulating insulin levels. It commonly develops as a compensatory response to insulin resistance, allowing the pancreas to produce more insulin to maintain glucose homeostasis. Understanding hyperinsulinemia provides insight into insulin signaling, glucose and lipid metabolism, obesity, metabolic syndrome, prediabetes, and type 2 diabetes.

Insulin signaling is a complex network of molecular pathways activated when insulin binds to its receptor. Through insulin receptor substrates, PI3K-Akt, MAP kinase pathways, GLUT4 trafficking, and other signaling mechanisms, insulin regulates glucose uptake, glycogen synthesis, lipid metabolism, protein synthesis, nutrient sensing, and cellular metabolism. Impaired insulin signaling is a major feature of insulin resistance and metabolic dysfunction.

PI3K-Akt signaling is a major intracellular pathway involved in metabolism, growth, survival, and gene regulation. Activated by insulin and other extracellular signals, the pathway connects receptors and IRS proteins with PI3K, PIP3, Akt, GLUT4, FOXO, mTORC1, and other downstream targets. Its functions are particularly important for glucose uptake, glycogen synthesis, lipid metabolism, protein synthesis, and insulin sensitivity.