Multiple Choice
The atrioventricular (AV) heart valves open and close _ .
A) as the circular muscles surrounding them operate
B) as papillary muscles and chordae tentinae pull them
C) passively, depending on the pressure of the blood in the atria and ventricles
D) entirely differently from the mechanism used to operate the semilunar valves.
Correct Answer:
Verified
Correct Answer:
Verified
Q18: What is true about heart valves?<br>A) They
Q19: Which artery supplies the anterior ventricular walls
Q20: Which of the veins listed here drains
Q21: What is true of the semilunar valves?<br>A)
Q22: These vessels carry oxygen-rich blood.<br>A) venae cavae
Q23: This structure is a remnant of a
Q24: Cardiac muscle tissue .<br>A) is found in
Q25: The major pumping chambers of the heart
Q26: The shapes and the thickness of the
Q28: The pulmonary trunk and arteries are color-coded