Little tunny is a fish found in the Atlantic Ocean. The photograph shows a little tunny. (Source: © Picture Partners/Alamy Stock Photo) The diagram shows the heart of a fish. Compare and contrast the structure of the heart of a fish with the heart of a mammal. (3) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

Biology

IGCSE&ALevel

EDEXCEL

Exam No：wbi13-01-que-20240523 Year：2024 Question No：IGCSE&ALevelBiology2024AS0601

Answer:

An answer that includes the following points to include 1 similarity and 1 difference:

SIMILARITIES:
- both (hearts) have atrium(a) and ventricle(s) (1)
- (in both) ventricle wall(s) thicker (than atrium wall(s)) (1)
- both have valves (1)

DIFFERENCES:
- fish heart has one \{atrium / ventricle\} whereas a mammalian heart has two \{atria / ventricles\} / fish has only one side to the heart, mammals have two / mammalian heart has septum, fish does not (1)
- fish heart has a \{sinus venosus / bulbus arteriosus\}, but a mammalian heart does not (1)

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Answer:

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