NUTRITION

August 17, 2008 at 4:29 am Leave a comment

NUTRITION

Ø Process by which organism obtains food
Ø Main life sustaining process of living thing organisms

DIVERSITY OF ANIMAL NUTRITION
1. AUTOTROPHS – organism that produce their own food
Eg. photosynthetic plants, photosynthetic bacteria (euglena)

2. HETEROTROPHS
– cannot produce their own food but rather they depend on autotrophs or other animals for food
– All animals are classified in this category

a. HOLOZOIC – animals that take their food in a solid or non-diffusable form

b. PARASITES – depend their food on the hosts

REASONS WHY LIVING ORGANISM NEED ENERGY

1. disassembly and repair of tissue components

2. muscular and neural activities

3. metabolic activities

4. maintenance of molecular structure

FACTORS-AFFECTING THE AMOUNT OF ENERGY NEEDED BY AN ORGANISM

1. no. of cells

2. the rate of metabolic / cellular activities

FOOD

– is utilized by organisms as energy source or raw material for the synthesize of its own biological molecules

– any substance when absorbed into the body, yields or produces energy

– these are substances that provide materials for growth, maintenance and repair of the body tissue

calorie – amount of energy needed to raise 1 gram of water to 1º C

CONSTITUENTS OF FOOD

1. carbohydrates – in plants, stored in the form of starch

– among animals, usually stored in the form of glycogen

– main source of energy in the human body

– 4 cal/g

2. protein

Functions

1. forms most important constituents of the protoplasm
2. build up and repair of tissues
3. provides osmotic pressure

3. fats

– 9 kcal/g

Functions

1. serves as compact fuel molecules
2. serves as food reserves
3. thermal insulators
4. pr of hormones

4. vitamins – organic compounds occurring in natural food which are required in minute amounts for growth, maintenance of life and reproduction

A. fat-soluble vitamins – attach/combined with fat to be used up by the body

Entry filed under: Biology. Tags: .

CONVERSION FACTORS ENDOCRINE SYSTEM

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