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Vitamins
Definition of Vitamins:
- Vitamins are essential organic molecules in the diet.
- Required in very small amounts for physiological functions.
- Generally, vitamins are not a source of energy, but some are involved in the metabolism of macronutrients.
- Classification by solubility:
- Fat-soluble vitamins: Contain hydrocarbon chains.
- Water-soluble vitamins: Contain hydroxyl groups.
- The principle of solubility: "like dissolves like".
Classification of Vitamins
Fat- or Water-Soluble:
- Example of a vitamin:
- Folic Acid:
- Important for nucleic acid synthesis.
- Helps to prevent certain types of anemia.
- Particularly crucial for pregnant women.
Minerals
Definition of Minerals:
- Minerals are either ions or inorganic compounds essential for good health.
- In the body, metallic elements typically exist as:
- Cations: Ions with a positive charge.
- Anions: Nonmetals often occurring as negatively charged ions.Essential Minerals:
- Important minerals are represented on a periodic table (specific minerals not listed in the transcript).
Food for Energy
Sources of Energy:
- Energy is obtained from the consumption of food, which includes fats, carbohydrates, and proteins.
- Initial energy source is sunlight, absorbed by green plants.Photosynthesis Process:
- Plants convert sunlight, carbon dioxide, and water into glucose.
- Chemical reaction:
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- Reactants: carbon dioxide (CO2), water (H2O), and energy from sunlight.
- Products: glucose (C6H12O6) and oxygen (O2).
Respiration
Process of Respiration:
- It is the reverse of the photosynthesis process.
- In respiration, glucose is broken down into simpler substances.
- Key reaction:
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- Reactants: glucose (C6H12O6) and oxygen (O2).
- Products: carbon dioxide (CO2), water (H2O), and energy released as a result of the chemical process.