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Q: The sino-atrial node is located in the –––––.
  • A. bladder
  • B. stomach
  • C. brain
  • D. heart
Correct Answer: Option D - Sino-atrial node is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The sinus nodes generates an electrical stimulus regularly, 60 to 100 times per minutes under normal conditions.
D. Sino-atrial node is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The sinus nodes generates an electrical stimulus regularly, 60 to 100 times per minutes under normal conditions.

Explanations:

Sino-atrial node is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The sinus nodes generates an electrical stimulus regularly, 60 to 100 times per minutes under normal conditions.