Answer:
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.
I'm guessing c since it's the only one talking about cultural.
If Tim is complaining of chest pain and has difficulty breathing, Tim is likely suffering a heart attack and 911 should be dialed immediately!
