Question 23
Transport in AnimalsBlood circulation in a mammal is said to be double because
- A.it passes twice through the heart in a complete circuit
- B.it moves in both arteries and veins
- C.it circulates in both the heart and other organs
- D.the heart contain auricles and ventricles.
Show the answer and explanation
Answer: A (it passes twice through the heart in a complete circuit)
Explanation
On one full trip round the body, blood passes through the heart twice: once on the way to the lungs and once on the way to the rest of the body.