Nutrition: The Process of Obtaining and Using Nutrients

Nutrition is the process by which organisms obtain and utilize nutrients to support growth, development, and energy production. It involves three essential steps:


1.     Ingestion:

The intake of food or nutrients.

2.     Digestion:

The breakdown of complex food molecules into simpler substances that can be absorbed.

3.     Absorption:

The uptake of nutrients from the digestive system into the bloodstream.

 

Types of Nutrition:

 

·         Autotrophic Nutrition:

Organisms like plants and some bacteria can produce their own food using sunlight, water, and carbon dioxide through photosynthesis.

·         Heterotrophic Nutrition:

Organisms like animals, fungi, and most bacteria obtain their food from other organisms.

Nutrients:

 

·         Essential Nutrients:

Nutrients that an organism cannot synthesize on its own and must obtain from its environment.

·         Energy Sources:

Nutrients provide energy for various cellular activities.

·         Building Blocks:

Nutrients are used to build and repair tissues.

 

 

 

Key Points:

 

·         Nutrient Acquisition:

Organisms obtain nutrients through ingestion or synthesis.

·         Digestion:

Complex food molecules are broken down into simpler forms for absorption.

·         Absorption:

Nutrients are absorbed into the bloodstream for distribution throughout the body.

·         Utilization:

Nutrients are used for energy production, tissue growth, and repair.

 

Nutrition is a fundamental process that ensures the survival and well-being of all living organisms.