Which of the following statements regarding the heart is NOT TRUE?

a.
It is situated between the lungs in the thoracic cavity.

b.
Your heart is approximately the size of your fist.

c.
Approximately 2/3 of its mass lies to the right of the body’s midline.

d.
The apex of the heart rests on the diaphragm.

e.
The base is where major blood vessels enter and exit the heart.