Where is the Sinu-atrial node located?

The SA node is located in the posterior wall of the right atrium near the entrance of the superior vena cava.

What is the name of the first branch off the aortic arch?

The first branch off the aortic arch is the Brachiocephalic artery. The second is the left common carotid artery. The third branch is the left subclavian artery.

Blood from the right atrium going to the right ventricle will go through what valve?

The Tricuspid valve

Where are the baroreceptors located?

Baroreceptors (pressure receptors)- monitor arterial pressure or changes in the arterial wall conformation and responsively raise or lower blood pressure. The receptors will also send signals to the medulla oblongta via the glossopharyngeal and vagus nerve. The medulla oblongota in return will adjust the heart rate and breathing rate to stabilize the blood pressure.

The left circumflex artery feeds what part of the heart?

• Left circumflex artery - supplies the:
  • Left atrium
  • Posterior left ventricle
  • SA node (45% of the population)
  • AV node (10% of the population)

The left anterior descending coronary artery supplies blood to the:

The left anterior descending artery provides blood to the anterior wall of the left ventricle, anterior ventricular septum, and bundle branches.