Bio molecules absorption, movement and excretion mechanism in human body

 

Here’s a clear overview of how biomolecules are absorbed, moved, and excreted in the human body — essentially the journey from intake to elimination:

🥗 1. Absorption

  • Carbohydrates → Digested into monosaccharides (glucose, fructose, galactose) and absorbed in the small intestine via transporters (GLUT, SGLT).
  • Proteins → Broken down into amino acids and small peptides, absorbed through specific amino acid transporters in the intestinal lining.
  • Lipids → Emulsified by bile salts, digested into fatty acids and monoglycerides, absorbed into intestinal cells, then packaged into chylomicrons for transport.
  • Vitamins & Minerals →
    • Fat-soluble vitamins (A, D, E, K) absorbed with lipids.
    • Water-soluble vitamins (C, B-complex) absorbed via diffusion or carriers.
    • Minerals (Ca²⁺, Fe²⁺, Mg²⁺, Na⁺, K⁺) absorbed through active transport or facilitated diffusion.
  • Water → Absorbed mainly in the small intestine by osmosis.

🚚 2. Movement (Transport & Distribution)

  • Bloodstream → Most absorbed biomolecules enter the portal vein and go to the liver for processing.
  • Lymphatic system → Lipids (chylomicrons) bypass the liver initially and enter circulation via the thoracic duct.
  • Cellular Uptake →
    • Glucose enters cells via insulin-regulated transporters.
    • Amino acids taken up for protein synthesis.
    • Fatty acids used for energy or stored in adipose tissue.
  • Intracellular Transport → Molecules move across cell membranes by diffusion, facilitated diffusion, active transport, or vesicular transport.
  • Systemic Distribution → Nutrients circulate to tissues for metabolism, growth, repair, and energy production.

🚾 3. Excretion (Removal of Waste)

  • Carbon dioxide (CO₂) → Produced during respiration, excreted via the lungs.
  • Nitrogenous waste → Amino acid breakdown produces ammonia, converted to urea in the liver, excreted by the kidneys.
  • Bile pigments → From hemoglobin breakdown, excreted in bile and eliminated in feces.
  • Excess salts & water → Removed by kidneys in urine.
  • Large undigested molecules → Excreted as feces through the digestive tract.
  • Sweat glands → Excrete water, salts, and small amounts of urea.

📊 Summary Table

StageBiomolecules InvolvedMechanism
AbsorptionGlucose, amino acids, fatty acids, vitamins, mineralsIntestinal transporters, bile action
MovementNutrients in blood/lymphCirculation, cellular uptake
ExcretionCO₂, urea, bile pigments, saltsLungs, kidneys, liver, sweat glands

✨ In short:

  • Absorption happens mainly in the small intestine.
  • Movement occurs via blood, lymph, and cell membranes.
  • Excretion removes metabolic waste through lungs, kidneys, liver, and skin.

Would you like me to create a flow diagram showing the journey of biomolecules from absorption → movement → excretion for a more visual understanding?

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