Question

question 13 (2 points)
the heart is located in the thoracic cavity
posterior to the sternum and superior to the diaphragm.
posterior to the sternum and inferior to the diaphragm.
anterior to the sternum and anterior to the vertebrae.
inferior to the diaphragm and anterior to the vertebrae.
question 14 (2 points)
the sa node sends an electrical impulse to the atria that causes them to
rest
depolarize
repolarize
relax

Explanation:

For Question 13, the heart is located in the thoracic cavity, posterior to the sternum and superior to the diaphragm. This is a basic anatomical fact. For Question 14, the SA (sino - atrial) node is the natural pacemaker of the heart. It sends an electrical impulse to the atria which causes them to depolarize, starting the cardiac cycle.

Answer:

Question 13: posterior to the sternum and superior to the diaphragm.
Question 14: depolarize