Water (H₂O): The most abundant molecule in the body, essential for numerous functions like:
* Transporting nutrients and waste products
* Regulating body temperature
* Facilitating chemical reactions
Electrolytes: Minerals that carry an electrical charge when dissolved in water, critical for:
* Nerve impulse transmission
* Muscle contraction
* Maintaining fluid balance
* Acid-base balance
Common Electrolytes:
* Sodium (Na+): Found in blood, extracellular fluid, important for nerve impulses and muscle contraction.
* Potassium (K+): Found in intracellular fluid, essential for muscle contractions, nerve impulses, and heart function.
* Calcium (Ca2+): Found in bones, teeth, and blood, vital for bone health, muscle contraction, nerve function, and blood clotting.
* Magnesium (Mg2+): Found in bones, teeth, and muscles, important for enzyme activity, muscle and nerve function, and blood sugar control.
* Chloride (Cl-) : Found in extracellular fluid, helps regulate blood volume and pH.
* Phosphate (PO₄³⁻): Found in bones, teeth, and cells, crucial for energy production, DNA, and RNA formation.
Other Important Inorganic Molecules:
* Carbon dioxide (CO₂): A byproduct of cellular respiration, transported in the blood and exhaled by the lungs.
* Oxygen (O₂): Essential for cellular respiration, taken in by the lungs and transported in the blood.
* Nitrogen (N₂): A component of proteins and nucleic acids, obtained from the diet.
* Iron (Fe): A component of hemoglobin, which carries oxygen in the blood.
Acids and Bases: While not technically "molecules" in the same way as the above, these are important for maintaining proper pH balance:
* Hydrochloric acid (HCl): Found in the stomach, aids digestion.
* Bicarbonate (HCO₃⁻): A major buffer in the blood, helps maintain proper pH.
It's important to note that the specific concentrations of these inorganic molecules can vary depending on factors like age, diet, and overall health.
