Question
What is an advantage of a double circulatory system in mammals?
A Blood can flow down the body on the left and up the body on the right.
B Blood can flow more slowly along the circulatory system.
C Blood pressure stays the same throughout the circulatory system.
D Oxygenated and deoxygenated blood are kept separate.
Answer/Explanation
Ans
D
Question
Mammals have a double circulation.
Which shows the correct sequence for the movement of blood in a mammal?
A body → heart → lungs → heart
B body → lungs → body → heart
C heart → lungs → body → heart
D heart → body → lungs → heart
Answer/Explanation
Ans: A
Question
The diagram shows a section through a fish heart and the direction of blood flow.
After leaving the heart, where will the blood flow to next?
A eyes
B fins
C gills
D tail muscle
Answer/Explanation
Ans: C