Choose the correct answer from the alternatives given. The SA node, which generates the electrical impulses that coordinate heart-muscle contractions, is located in the
A
Medulla oblongata
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B
Posterior vena cava
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C
Left ventride
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D
Right atrium
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Solution
The correct option is D Right atrium The sino-atrial (SA) node is a specialized bundle of neurons located in the upper part of the right atrium of the heart. The cardiac impulse originating from the SA node triggers a sequence of electrical events in the heart, thereby controlling the sequence of muscle contraction that pumps blood out of the heart.