A) Haemophilia?Blood cancer
B) SA-node?Pacemaker
C) Malleus?Anuil
D) Leucocytes?Lymphocytes
Correct Answer: B
Solution :
SA-node (heart of heart and brain of heart) is a specialised bundles of muscles located is the right wall of right atrium below the opening of superior vena cava. It has highest degree of autorhythmicity (generate beating impulse at the rate of 70-80 times/minute).
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