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Where does the energy that makes life possible come from? Humans obtain energy from three classes of fuel molecules: carbohydrates, lipids, and proteins.
- Cell Metabolism
Catabolic pathways involve the breakdown of nutrient...
- Cell Metabolism
Dietary sources of energy. The typical human diet consists chiefly of carbohydrates, fats, proteins, water, ethanol, and indigestible components such as bones, seeds, and fibre (mostly cellulose). Carbohydrates, fats, and proteins typically comprise ninety percent of the dry weight of food. [10] .
About 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium. All 11 are necessary for life.
Human nutrition is the process by which substances in food are transformed into body tissues and provide energy for the full range of physical and mental activities that make up human life. Foods supply nutrients that are critical for human growth.
As we have just seen, cells require a constant supply of energy to generate and maintain the biological order that keeps them alive. This energy is derived from the chemical bond energy in food molecules, which thereby serve as fuel for cells.
14 Νοε 2023 · If the carbohydrate has two sugar units, we call it a disaccharide. Di means two, and saccharide means sugar. Examples of disaccharides include: sucrose (table sugar); lactose (milk sugar) and maltose (sugar in grains). Sucrose is made of a glucose linked together with a fructose.
The energy provided by macronutrients in food is measured in kilocalories, commonly called Calories, where 1 Calorie is the amount of energy needed to raise 1 kilogram of water by 1 degree Celsius. Carbohydrates
