Question
Which row shows the chambers of the heart, from those with the thickest walls to those with the thinnest walls?
▶️Answer/Explanation
Ans: C
Question
Why is aspirin sometimes used as a drug to reduce the risk of coronary heart disease?
A It reduces blood pressure.
B It reduces pain.
C It reduces the tendency for blood to clot.
D It relaxes artery walls.
Answer/Explanation
Ans
C
Question
The diagram shows a section through the heart.
What is the function of the structure labelled Q?
A It controls the amount of blood leaving the heart.
B It increases the pressure in part R.
C It prevents backflow of blood into part P.
D It prevents blood flowing into the vena cava.
Answer/Explanation
Ans
C
Question
The graph shows pressure changes that take place in the right atrium, right ventricle and left ventricle of a human heart when the muscle walls contract and relax.
What is the pressure in the right ventricle when the left ventricle is at its maximum pressure?
A 0.4 kPa B 2.0 kPa C 3.0 kPa D 15.0 kPa
Answer/Explanation
Ans: C