Answer:
D) four.
Explanation:
The two atria hold the blood that circulates away from the heart. The heart has four one-way valves, which open and close with each heartbeat. The tricuspid valve and the mitral valve are located between the atria and allow the blood to flow from the atria to the ventricles. Also you don't have to but mind marking Brainliest?
Turfe did 2 sets of 100 reps :)
<span>Deltoid, gluteus medius, rectus femoris, vastus lateralis. Most used are Vastus lateralis and rectus femoris in infants b/c of poorly developed gluteus muscles.</span>
