The following statements relate to the flow of blood through the heart.
1 Oxygenated blood flows through the right side of the heart.
2 The vena cava empties deoxygenated blood into the ventricle.
3 The heart pumps oxygenated blood through the pulmonary artery.
4 There is a valve that prevents backflow of blood from the aorta into the left
ventricle.
Which of these statements is / are correct?

Answer:

Statement 1 is incorrect because deoxygenated blood flows through the right side of the heart.
Statement 2 is incorrect because blood from the vena cava enters a top chamber which is an atrium.
Statement 3 is incorrect because the pulmonary artery is one of the few arteries that carries
deoxygenated blood.
Statement 4 is correct because there are valves in the base of the aorta to prevent the backflow of
blood into the ventricle, when the ventricle relaxes.
The answer is C