<span>The answer to this question would be: keep blood moving forward through the heart
When the ventricle contracts, the valve will plug the hole to atrium so the blood will be pump to the body. The valve in heart will prevent backflow of blood from ventricle to atrium which makes the blood keep moving forward. A defect in valve could reduce heart deficiency as a part of the blood might be going back to the atrium, called regurgitation.</span>
Heart valves function to keep blood moving forward through the heart. The heart has four valves. These four valves control <span> control the flow of blood through the </span>heart( th<span>e mitral </span>valve<span> and tricuspid </span>valve<span>,control blood flow from the atria to the ventricles and the aortic </span>valve<span> and pulmonary </span>valve <span>control blood flow out of the ventricles)</span>
Regardless of latitude or time of year, the sun's angle reaches closest to 90 degrees (perpendicular lines are 90 degrees) -- and is therefore at its most intense -- at the midpoint of the day: noon.
The proportion of mottled fish will
increase over time because of the construction company that dumps a load of
gravel in the bottom of the lake which give it a mottled appearance that made
the mottled fish invisible by their major predator which is the wading bird that hunts them
by sight.
