★ The Circulatory System Quiz
The heart is enclosed in a protective sac called __________.
A. myocardium
B. capillaries
C. valve
D. pericardium
Preview next quiz:
Prevents the backflow of blood and ensures that blood flows only in one direction.
A. valves
B. aorta
C. ventricle
D. atrium
Disclaimer:
Medical Quiz should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. All content on this website is for informational and educational purposes only.