<prompt> All of the following are true about the Right Coronary Aery RCA except___RCA diameter is less than left coronary aeryRCA arises from the anterior aoic sinusRCA gives rise to circumflex coronary branchRight Coronary aery is the first branch of RCA  <response>: The right coronary aery arises from the anterior aoic sinus Right coronary sinus of the ascending aoa. Option B It passes anteriorly and descends veically in the coronary sulcus between the right atrium and the right ventricle. On reaching the inferior margin, it turns posteriorly and continues in the sulcus on to the diaphragmatic surface and the base of the hea. The diameter of the right coronary aery is less than that of the left coronary aery option A The right coronal aery is, usually the first branch of the coronary aery. Option D The circumflex coronary aery is a branch of the left coronary aery and is the exclusive supplier to the right bundle branch. Ref: Grays Anatomy 41st edition Pgno: 1016 