Q.1.
Which vessels have valves and thin walls?
Q.2.
Humans have a double circulation system. How many circuits are there in this system?
Q.3.
Which blood vessels have very thick walls?
Q.4.
What are the chambers of the heart called?
Q.5.
Cigarette packets contain health warnings. Cigarettes can cause heart attacks when what forms in the coronary artery?
Q.6.
What are released from white blood cells in order to protect the body from pathogens?
Q.7.
The job of heart valves is to prevent what?
Q.8.
Which type of blood cell carries oxygen?
Q.9.
Inside which artery would a stent be placed?
Q.10.
In which part of the heart does the aorta originate?