Question
In which one of the following pairs the two items mean one and the same thing
Malleus - anvil
SA node - pacemaker
Leucocytes - lymphocytes
Haemophilia - blood cancer
Solution
B.
SA node - pacemaker
The sinoatrial node (SA node), also known as sinus node, is a group of cells located in the wall of the right atrium of the heart. These cells have the ability to spontaneously produce an electrical impulse, that travels through the heart via the electrical conduction system causing it to contract. In a healthy heart, the SA node continuously produces action potential, setting the rhythm of the heart and so is known as the heart's natural pacemaker.
