Multiple choice

Which membrane serves as a blood-heart barrier?

  1. Epicardium

  2. Myocardium

  3. Endocardium

  4. Pericardium

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Endocardium serves as a kind of blood-heart barrier and thus, controlling the ionic composition of the extracellular fluid in which the cardiomyocytes bathe.