Question
Fig. 3.1 shows the blood flow to certain parts of the body of a student who is sitting down.
(a) Use Fig. 3.1 to state the blood flow to the skeletal muscles in the student when he is sitting
down.
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(b) State the name of two organs in the body whose blood flow is not shown on the graph.
1 ………………………………………………………………………………………………………………………………
2 ………………………………………………………………………………………………………………………………
Fig. 3.2 shows the blood flow to the same parts of the body when the student is exercising.
(c) (i) Use the information from Fig. 3.1 and Fig. 3.2 to calculate the percentage increase in the
blood flow to the skeletal muscles when the student exercises.
Show your working.
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(ii) During exercise the muscles need more energy.
Name two chemicals the muscles absorb from the blood to release energy for contraction.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
(iii) Explain why blood flow to the heart muscle increases when the person exercises.
………………………………………………………………………………………………………………………….
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(d) Fig. 3.1 and Fig. 3.2 show that during exercise the blood flow to the alimentary canal and the
blood flow to the skin change.
(i) Describe the changes in blood flow that occur in the alimentary canal and the skin during
exercise.
alimentary canal ………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
skin ……………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
(ii) Suggest a reason for the change in blood flow to the alimentary canal during exercise.
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(iii) Explain why the blood flow to the skin changes during exercise.
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
Answer/Explanation
Ans:
Question
The boxes on the left describe processes carried out by cells.
The boxes on the right contain the names of the cells that carry out these processes.
Draw one straight line from each box on the left to a box on the right to link the process to the cell type.
Draw six lines.
An example has been done for you.
Answer/Explanation
Ans:
