In which one of the following pairs do the tw | vedclass

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(B) The $SA$ node (Sinoatrial node) is located in the right atrium of the heart and is responsible for initiating the electrical impulses that cause t

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$SA$ node - pacemaker

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(B) The $SA$ node (Sinoatrial node) is located in the right atrium of the heart and is responsible for initiating the electrical impulses that cause the heart to contract. Because it sets the rhythm of the heartbeat,it is commonly referred to as the natural pacemaker of the heart.- Malleus is a bone in the middle ear,while the anvil is the common name for the incus bone; they are distinct.- Leucocytes are white blood cells (a general category),while lymphocytes are a specific type of white blood cell.- Haemophilia is a genetic bleeding disorder,whereas blood cancer is known as leukaemia.

In which one of the following pairs do the two items mean one and the same thing?

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Analogy type questions:
$(1)$ Right atrium and right corner : $SA$ node :: Corner of right atrium : .......
$(2)$ First heart sound : $Lubb$ :: Second heart sound : ...........

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