Multiple choice

The sino-auricular valve occurs

  1. in the sinus venosus

  2. between the sinus venosus and the atrium

  3. in the truncus arteriosus

  4. at the auriculo-ventricular aperture
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sino-auricular (sinuatrial) valve is located between the sinus venosus and the right atrium in non-mammalian vertebrates. It prevents backflow of blood from the atrium into the sinus venosus. In mammals, the sinus venosus is incorporated into the right atrium.

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