Science
How many chambers are there in the heart of the following organisms? How is mixing of oxygenated and deoxygenated blood prevented in their body?
(a) Fishes
(b) Humans
Circulatory System
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Answer
(a) Fishes have a two-chambered heart.
Their heart pumps only deoxygenated blood to the gills. Oxygenated blood from gills goes straight to the body without re-entering the heart. This prevents mixing of oxygenated and de-oxygenated blood.
(b) Humans have a four-chambered heart.
Right (deoxygenated) and left (oxygenated) sides are separated by the septum, with one-way valves keeping flows apart preventing mixing of oxygenated and de-oxygenated blood.
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