Question 21
Transport in AnimalsA circulatory system that does not allow mixing of oxygenated and de-oxygenated blood in mammalian heart is referred to as
- A.open
- B.haemocoelic
- C.single
- D.closed.
Show the answer and explanation
Answer: D (closed.)
Explanation
In mammals blood stays inside vessels and the heart is fully divided, so oxygenated and deoxygenated blood are kept apart. Of the options, this matches a closed system.