Figure 11 shows the time taken for blood to clot at different temperatures - Edexcel - GCSE Biology - Question 6 - 2020 - Paper 1
Question 6
Figure 11 shows the time taken for blood to clot at different temperatures.
| temperature in °C | time taken for blood to clot in seconds |
|--------------------|--... show full transcript
Worked Solution & Example Answer:Figure 11 shows the time taken for blood to clot at different temperatures - Edexcel - GCSE Biology - Question 6 - 2020 - Paper 1
Step 1
Give two safety precautions that should be used when handling blood samples.
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Answer
Wear gloves: Always wear gloves to protect against contamination and exposure to bloodborne pathogens.
Use proper disposal: Ensure to dispose of any materials that come in contact with blood (like syringes and swabs) in designated biohazard containers.
Step 2
Which part of the blood causes blood to start clotting?
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Answer
C platelets. Platelets are small cell fragments that play a crucial role in the blood clotting process by aggregating to form a plug at the site of injury.
Step 3
Give one advantage of a blood clot forming.
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Answer
One advantage of a blood clot forming is that it prevents excessive blood loss following an injury, which is essential for wound healing and protection against infection.
Step 4
Explain how one structure of a vein helps the blood return to the heart.
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Answer
Veins have valves that prevent the backflow of blood. These valves ensure that blood flows in one direction, towards the heart. Additionally, the contraction of surrounding skeletal muscles helps to push the blood back to the heart, making the return flow more efficient.
