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.
(Solved)
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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Answers (1)
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Differentiate between haemolysis and crenation.
(Solved)
Differentiate between haemolysis and crenation.
Date posted:
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?
(Solved)
Explain happens when you place a visking tubing half filled with sugar solution immersed in a beaker with distilled water.
Date posted:
December 4, 2017
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Answers (1)
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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:
(i) Using iodine
(ii) Adding a drop of water to the specimen.
(iii) Using a thin piece of the specimen
Date posted:
December 4, 2017
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Answers (1)
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Give the functions of the following parts of a microscope (i) Revolving nose piece (ii) Condenser (iii) Eye piece
(Solved)
Give the functions of the following parts of a microscope
(i) Revolving nose piece
(ii) Condenser
(iii) Eye piece
Date posted:
December 4, 2017
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Answers (1)
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Give two differences between common names and scientific names.
(Solved)
Give two differences between common names and scientific names
Date posted:
December 4, 2017
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Answers (1)
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What are the differences between plants and animals?
(Solved)
What are the differences between plants and animals?
Date posted:
December 3, 2017
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Give reasons why a motor vehicle is not a living thing.
(Solved)
Give reasons why a motor vehicle is not a living thing
Date posted:
December 3, 2017
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Answers (1)
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Name and explain 5 branches of biology
(Solved)
Name and explain 5 branches of biology
Date posted:
December 3, 2017
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Answers (1)
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The ileum has various adaptations for absorption of digested food substances. Explain.
(Solved)
Explain how the ileum is adapted to absorption.
Date posted:
December 3, 2017
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Answers (1)
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What are the adaptations of xerophytes?
(Solved)
What are the adaptations of xerophytes?
Date posted:
November 22, 2017
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Answers (1)
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The graph below shows daily variation of human body temperature over three days
(Solved)
The graph below shows daily variation of human body temperature over three days
(i)What is the maximum range of body temperature under normal conditions as shown in the graph?
(ii)At what time each day does body temperature drop to its lowest level?
(iii)Suggest a reason for the drop in temperature at the time referred to in (ii) above
(iv)Children typically have higher temperature than adults.Suggest a reason for this
(v)What is the advantage of the higher body temperature in children?
Date posted:
November 21, 2017
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Answers (1)
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Which waste product is almost absent in the renal vein but present in the renal artery?
(Solved)
Which waste product is almost absent in the renal vein but present in the renal artery?
Date posted:
November 20, 2017
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Answers (1)
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The diagram shows microscopic detail from a human lung
(Solved)
The diagram shows microscopic detail from a human lung
(i)Name the part labelled A,B and C
(ii)Give two features of the structures in the diagram that allow for efficient gas exchange
(iii)Which gas,dissolved in the blood,can trigger deeper or faster breathinggf
Date posted:
November 20, 2017
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Answers (1)
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The diagram below shows the internal structure of a leaf
(Solved)
The diagram below shows the internal structure of a leaf
(i)Name the one tissue type that is found at both W and X
(b)The cell at W contains many organelles that carry out photosynthesis.
Suggest why the cells at W contain more of these organelles than the cells at cells at X
(c)In layer X,gases can diffuse throughout the leaf.Name one such gas
(d)State one function of the opening at Z
Date posted:
November 20, 2017
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Answers (1)
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The diagram below shows a section through human skin
(Solved)
The diagram below shows a section through human skin
(i)Name the parts labelled A,B and C
(ii)The skin is one of the excretory organs in humans
name one substance excreted by the skin
(iii)List two other functions of the skin
Date posted:
November 20, 2017
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Answers (1)
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Amoeba is a tiny ,one-celled organism.This diagram below shows the structure of a fresh water Amoeba as seen through a light microscope
(Solved)
Amoeba is a tiny ,one-celled organism.This diagram below shows the structure of a fresh water Amoeba as seen through a light microscope
(a)Name parts labelled A,C and D on the diagram
(b)state:-One function of part A
-One function of part C
Date posted:
November 20, 2017
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Answers (1)
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State the theories explaining the origin of HIV/AIDS
(Solved)
State the theories explaining the origin of HIV/AIDS
Date posted:
November 18, 2017
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Answers (1)
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Give two reasons why lipids are not suitable respiratory substrates
(Solved)
Give two reasons why lipids are not suitable respiratory substrates
Date posted:
November 17, 2017
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Answers (1)
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A strip of a herbaceous Tradescantia was cut longitudinally as shown below and placed in solution X.After one hour,the strips appeared as shown below.
(Solved)
A strip of a herbaceous Tradescantia was cut longitudinally as shown below and placed in solution X.After one hour,the strips appeared as shown below.
(a)What was the nature of solution X?
(b)What physiological process was being investigated?
(b)Account for the results at the end of experiment after one hour
Date posted:
November 16, 2017
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Answers (1)