Answer:
The answer is B, To ensure that blood flows in one direction.
Explanation:
Your valves are there to prevent backwards blood flow and keep your blood moving all in one direction.
Answer:
50 percent of all poisonings involve children under 5 years old
Answer:
Multiple sclerosis is a chronic disease that affects the central nervous system, especially the brain, spinal cord, and optic nerves.
Explanation:
Answer:
inferior and superior vena cava
right atrium
right ventricle
pulmonary artery
the purple box is the lungs.
after it is the pulmonary vein
than left atrium,
left ventricle
aorta
arteries
capillaries
