Exam-style question
Try this first
What is the main function of valves in the circulatory system?.
- A.To pump blood through the body
- B.To prevent blood from flowing backwards
- C.To carry oxygenated blood
- D.To connect arteries and veins
Answer and explanation
Attempt the question first, then reveal the model answer and explanation.
Common mistake
No common mistake is linked to this question yet.