inferior vena cava.
The heart pumps blood to the lungs to be reoxygenated. Valves in our veins and the muscle contractions of our legs helps bring blood from the lower limbs to the heart.
The blood in the femoral artery is oxygenated and rich in nutrients, as it carries blood away from the heart to supply the lower limbs. In contrast, the blood in the femoral vein is deoxygenated and contains waste products, as it returns blood from the lower limbs back to the heart. Additionally, the femoral artery has thicker, more muscular walls to withstand higher pressure, while the femoral vein has thinner walls and valves to help prevent backflow.
Blood is returned to the heart via the vena cava, specifically the superior vena cava from the upper body and the inferior vena cava from the lower body.
Most of the trunk and the lower limbs
From the capillaries of the abdominal organs and hind limbs, blood flows to the inferior vena cava. The inferior vena cava is the largest vein in the human body responsible for carrying deoxygenated blood from the lower half of the body back to the heart.
The inferior vena cava brings blood from the lower parts of the body to the heart. The blood is deoxygenated.
The ventricles is the lower heart chambers not the blood vessels that direct blood toward the heart.
Heart blood vessels is what collects blood and pumps it to the lower chamber. This is what keeps the heart in working function.
At rest, the oxygen content of venous blood returning to the heart is typically around 60-75% saturated with oxygen, depending on various factors such as body metabolism and activity level. This means that the venous blood carries a lower concentration of oxygen compared to arterial blood, which is about 95-100% saturated. The amount of oxygen returned to the heart in venous blood is generally around 4-5 mL of oxygen per deciliter of blood. Thus, the heart receives a significant amount of deoxygenated blood, which it then pumps to the lungs for reoxygenation.
Ventricles
The ventricles are the lower chambers of the heart. The atria are the upper chambers.
Blood coming from the lungs has lower pressure while that from the heart has higher pressure. Blood coming from the lungs also has higher oxygen content and lower carbon dioxide content compared to that coming from the heart.