how do organs obtain their nutrition
Answers
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Nutrients :- Nutrients are substance which provide nourishment i.e. essential for maintenance of life and for growth of organisms.
Only food ( nutrients ) are not obtaining energy, oxygen is also required for this process.
Proteins, fats, carbohydrates, vitamins , minerals , and water are nutrients.
Your digestive system breaks nutrients into parts small enough for your body to absorb and use for energy, growth, and cell repair.
For eg. -
a) Carbohydrates, fats and lipids are energy giving nutrients.
b) Protein is bodybuilding nutrient.
c) Vitamins and minerals are protective and regulating nutrients.
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Answer:
Since the food and the way it is obtained differ, the digestive system is
different in various organisms. In single-celled organisms, the food
may be taken in by the entire surface. But as the complexity of the
organism increases, different parts become specialised to perform
different functions. For example, Amoeba takes in food using
temporary finger-like extensions of the cell surface which fuse over
the food particle forming a food-vacuole (Fig. 6.5). Inside the foodvacuole, complex substances are broken down into simpler ones
which then diffuse into the cytoplasm. The remaining undigested
material is moved to the surface of the cell and thrown out. In
Paramoecium, which is also a unicellular organism, the cell has a
definite shape and food is taken in at a specific spot. Food is moved
to this spot by the movement of cilia which cover the entire surface
of the cell.
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