Active transport is a process by which substances move across the cell membrane and against concentration gradient by use of energy.
The role of active transport in animals include:
Re-absorption of sugars and some salts by the kidney. Useful substances are re-absorbed back into the blood stream from the kidney tubules by active transport.
Accumulation of substances in the body to offset osmotic imbalance in arid and saline environment.
Absorption of digested from the alimentary canal into the blood stream.
Faimus answered the question on December 4, 2017 at 16:21
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A red blood cell is placed in distilled water. Explain what happens to the red blood cell.
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A red blood cell is placed in distilled water. Explain what happens to the red blood cell.
Date posted:
December 4, 2017
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Differentiate between haemolysis and crenation.
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December 4, 2017
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Differentiate between osmotic pressure and osmotic potential
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December 4, 2017
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Explain happens when you place a visking tubing half filled with sugar solution immersed in a beaker with distilled water?
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Explain happens when you place a visking tubing half filled with sugar solution immersed in a beaker with distilled water.
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December 4, 2017
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Osmosis is referred to as a special type of diffusion. Explain
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December 4, 2017
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Briefly explain why diffusion is not sufficient for transport purposes in human beings.
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Briefly explain why diffusion is not sufficient for transport purposes in human beings.
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December 4, 2017
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State and explain any two roles of diffusion in plants.
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State and explain any two roles of diffusion in plants.
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December 4, 2017
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Diffusion is one of the physiological processes in both plants and animals. Define diffusion
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December 4, 2017
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Why do we say the cell membrane is semipermeable
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December 4, 2017
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The cell membrane forms the outer covering of animal cells. Give its properties.
(Solved)
The cell membrane forms the outer covering of animal cells. Give its properties.
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December 4, 2017
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(Solved)
Differentiate between an organ and organ system giving an example for each
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December 4, 2017
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The following are tissues found in plants, briefly explain their functions: (i) Epidermal tissue (ii)Parenchyma tissue
(Solved)
The following are tissues found in plants, briefly explain their functions:
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Date posted:
December 4, 2017
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(Solved)
Differentiate between a cell and a tissue.
Date posted:
December 4, 2017
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(Solved)
Define cell specialization and give an example.
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December 4, 2017
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In the preparation of temporary slides, the following measures are taken into consideration state their importance: (i) Using iodine (ii)Adding a drop of water to the specimen....
(Solved)
In the preparation of temporary slides, the following measures are taken into consideration state their importance:
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Date posted:
December 4, 2017
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(Solved)
Give four differences between a plant cell and an animal cell
Date posted:
December 4, 2017
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Name two organelles found in the plant cells only.
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December 4, 2017
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(Solved)
Name the cell organelles that are found in large amounts in muscle cells.
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December 4, 2017
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Give the functions of the following cell organelles (i) Centrioles (ii) Ribosomes (iii) Golgi apparatus
(Solved)
Give the functions of the following cell organelles
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Date posted:
December 4, 2017
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(Solved)
Give 5 differences between a light microscope and electron microscope.
Date posted:
December 4, 2017
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