Blood flows from the right atrium through the _____ valve into ...

[Jkov05]

Blood flows from the right atrium through the _____ valve into the right ventricle.
 
  a. mitral
  b. aortic
  c. pulmonic
  d. tricuspid

Question 2

The thick, muscular middle layer of the heart wall that contains the atrial and ventricular muscle fibers necessary for contraction is the _____.
 
  a. epicardium
  b. pericardium
  c. myocardium
  d. endocardium

[Mholman93]

Answer to Question 1

D
Blood flows from the right atrium through the tricuspid valve into the right ventricle.

Answer to Question 2

C
The myocardium (middle layer) is a thick, muscular layer that consists of cardiac muscle fibers (cells) responsible for the pumping action of the heart.

[Jkov05]

Gracias!

[hollysheppard095]

Thanks for the timely response, appreciate it