Major Elements (by mass):
* Oxygen (O): ~65% of the body's mass, found in water, proteins, carbohydrates, fats, and other molecules.
* Carbon (C): ~18.5% of the body's mass, forms the backbone of all organic molecules, including proteins, carbohydrates, lipids, and nucleic acids.
* Hydrogen (H): ~9.5% of the body's mass, found in water, proteins, carbohydrates, and fats.
* Nitrogen (N): ~3.2% of the body's mass, found in proteins, nucleic acids (DNA and RNA), and other nitrogen-containing compounds.
* Calcium (Ca): ~1.5% of the body's mass, forms bones and teeth, plays a role in muscle contraction, nerve impulse transmission, and blood clotting.
* Phosphorus (P): ~1% of the body's mass, found in bones, teeth, nucleic acids, and energy-carrying molecules like ATP.
* Potassium (K): ~0.35% of the body's mass, involved in nerve impulse transmission, muscle contraction, and fluid balance.
* Sulfur (S): ~0.25% of the body's mass, found in proteins and some vitamins.
* Sodium (Na): ~0.15% of the body's mass, helps regulate fluid balance and nerve impulse transmission.
* Chlorine (Cl): ~0.15% of the body's mass, found in body fluids, helps maintain fluid balance.
* Magnesium (Mg): ~0.05% of the body's mass, involved in over 300 enzyme reactions, muscle contraction, and nerve impulse transmission.
Trace Elements (small amounts):
These are essential for various bodily functions, but are present in much smaller amounts than the major elements:
* Iron (Fe): component of hemoglobin (oxygen transport in blood)
* Zinc (Zn): involved in immune function and wound healing
* Iodine (I): essential for thyroid hormone production
* Fluorine (F): strengthens teeth
* Copper (Cu): involved in iron metabolism and nerve function
* Manganese (Mn): involved in bone formation and metabolism
* Chromium (Cr): helps regulate blood sugar
* Selenium (Se): an antioxidant
* Molybdenum (Mo): involved in various enzyme reactions
Compounds:
The body is primarily composed of water (about 55-78% of body mass), followed by proteins, carbohydrates, lipids (fats), nucleic acids (DNA and RNA), and various other organic and inorganic compounds.
It's important to note:
* The exact proportions of elements and compounds can vary depending on factors like age, sex, body composition, and overall health.
* The human body is a dynamic system, constantly undergoing chemical reactions and exchanging materials with its environment.
This list provides a basic overview of the ingredients that make up the human body. The complex interplay of these elements and compounds creates the remarkable and intricate system that we are.
