The aortic valve.
The blood goes through the heart in the correct direction because there are a number of one-way valves in the heart chambers that blood can only pass through in the correct direction.
The heart help the body by circulating the blood throughout the body .It also ensures that the oxygen flows in all different parts of the body .
Blood with no oxygen (the blood that flows to the heart picks up oxygen from the lungs).
When the ventricle contracts and pushes blood through the left semilunar valve, the blood enters the aorta. From the aorta, it is distributed to the rest of the body through systemic circulation, delivering oxygen and nutrients to tissues and organs. The left semilunar valve ensures that blood flows in the correct direction, preventing backflow into the ventricle during relaxation.
Oxygen.
After taking oxygen from the lungs the blood travels to the left atrium of the heart. From here the blood is pumped to the left ventricle. The left ventricle then pumps the oxygenated blood into the aorta through which it flows to the rest of the body.
blood
Countercurrent breathing is a method of gas exchange in which water flows in the opposite direction to blood flow. This enables a more efficient exchange of gases, such as oxygen and carbon dioxide, between the gills and blood in fish. It enhances the uptake of oxygen and removal of carbon dioxide from the blood.
Oxygen flows into your blood when you breath April:)
red blood cells
Blood flows through veins after delivering oxygen to the body.
Blood that flows into the right atrium is returning from the body and is deoxygenated. This means that it contains less oxygen and mostlycarbon dioxide.