Match the following circulatory systems with the correct animals. 1. closed circulatory system earthworm 2. two-chambered heart fish 3. four-chambered heart birds

Fish is 3

Earth worm is 1

Bird is 2

The right matches are:

1. closed circulatory system = => earthworm

2. two-chambered heart = => fish

3. four-chambered heart = => birds

The heart of a fish has two compartments. In pulmonate fish, the partitioning of the heart is imperfect, only the atrium is partitioned. The absence of compartmentalization in the ventricle (as is the case in mammals), is compensated by the presence of a spiral blade that avoids the mixing of oxygenated blood (lungs) and deoxygenated blood (organs).

The heart of the birds is quite close to that of the Man (4 cavities).

Earth annelids such as earthworms have a closed circulatory system.