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Compare the differences between the structure of the circulatory system of a fish and the human circulatory system - Edexcel - GCSE Biology Combined Science - Question 3 - 2016 - Paper 1
Question 3
Compare the differences between the structure of the circulatory system of a fish and the human circulatory system. Figure 3 shows a diagram of the circulatory syst... show full transcript
Worked Solution & Example Answer:Compare the differences between the structure of the circulatory system of a fish and the human circulatory system - Edexcel - GCSE Biology Combined Science - Question 3 - 2016 - Paper 1
Step 1
Difference in Circulation Type
Answer
Fish have a single circulatory system where blood passes through the heart only once during each complete circuit, resulting in lower blood pressure. In contrast, humans have a double circulatory system where blood passes through the heart twice, leading to higher pressure and more efficient oxygen delivery.
Step 2
Presence of Heart Chambers
Answer
The fish circulatory system comprises two main chambers in the heart: one atrium and one ventricle. This contrasts with humans, who have a four-chambered heart composed of two atria and two ventricles, facilitating separation of oxygenated and deoxygenated blood.
Step 3