The direction of blood flow through the heart is best described ...

[geoffrey]

The direction of blood flow through the heart is best described by which of these?
 
  a. Vena cava right atrium right ventricle lungs pulmonary artery left atrium left ventricle
  b. Right atrium right ventricle pulmonary artery lungs pulmonary vein left atrium left ventricle
  c. Aorta right atrium right ventricle lungs pulmonary vein left atrium left ventricle vena cava
  d. Right atrium right ventricle pulmonary vein lungs pulmonary artery left atrium left ventricle

Question 2

The sac that surrounds and protects the heart is called the:
 
  a. Pericardium.
  b. Myocardium.
  c. Endocardium.
  d. Pleural space.

[dantucker]

Answer to Question 1

ANS: B
Returning blood from the body empties into the right atrium and flows into the right ventricle and then goes to the lungs through the pulmonary artery. The lungs oxygenate the blood, and it is then returned to the left atrium through the pulmonary vein. The blood goes from there to the left ventricle and then out to the body through the aorta.

Answer to Question 2

ANS: A
The pericardium is a tough, fibrous double-walled sac that surrounds and protects the heart. It has two layers that contain a few milliliters of serous pericardial fluid.