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Figure 19 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human - Edexcel - GCSE Biology - Question 8 - 2018 - Paper 1

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Figure 19 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human. These cells are animal cells. Animal cells do not have ... show full transcript

Worked Solution & Example Answer:Figure 19 shows a diagram of a red blood cell from a turtle and a diagram of a red blood cell from a human - Edexcel - GCSE Biology - Question 8 - 2018 - Paper 1

Step 1

Give one safety precaution you need to take when handling animal tissue such as blood vessels.

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Answer

One safety precaution is to wash hands thoroughly after handling animal tissues to prevent contamination or infection.

Step 2

Explain why the circulatory system of a frog is less efficient at carrying oxygen to the tissues than the circulatory system of a human.

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Answer

The frog's circulatory system is less efficient for several reasons:

  1. Three Chambers: Frogs have a heart with three chambers (one ventricle and two atria), which allows for mixing of oxygenated and deoxygenated blood.
  2. Blood Mixing: This mixing reduces the efficiency of oxygen delivery to the tissues, as not all blood sent to the body is fully oxygenated.
  3. Adaptation: In contrast, humans possess a four-chambered heart, which keeps oxygenated and deoxygenated blood separate, allowing for more effective oxygen transport.

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