The heart is the organ responsible for pumping blood, while blood vessels (arteries, veins, and capillaries) function as the tissues through which blood flows in the circulatory system.
The plant you are describing is likely a dicot, such as a dandelion. Dicots have leaves with branched veins, taproots, and stems made primarily of collenchyma, parenchyma, and sclerenchyma cells.
The vascular tissue, specifically the phloem, is responsible for transporting food (sugars) from the leaves to other parts of the plant. The xylem is responsible for transporting water and minerals from the roots to the rest of the plant.
If you were to walk through the forest and find a plant that has flowers with three petals, leaves and parallel veins, it is most likely a monocot.
anterior tibial, femoral, posterior tibialfemoral, posterior tibial, anterior tibial
Veins are responsible for the movement of deoxgenated blood from the heart
Moving blood to and from the heart
It's responsible for the beating of the heart and closing of valves in the veins of the legs.
The veins and arteries.
most likely your blood vessels and veins
The veins responsible for returning blood to the heart are the Superior and Inferior Vena Cava. Arteries send blood away from the heart, going from Arteries to Arterioles to Capillaries, then the return is from Capillaries to Venules to Veins. The Superior and Inferior Vena Cava are the veins that send blood to the right atrium after an entire blood circulation cycle.
Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart. This differentiates the pulmonary veins from other veins in the body, which are used to carry deoxygenated blood from the rest of the body back to the heart
Elderly people are more likely to get varicose veins. They are generally less active and the more people sit around not moving, the more likely they will get vein problems in the legs.
veins are responsible for bringing blood back to the heart.
The heart
The spaces between leaf veins are called interveinal areas. These areas are usually filled with chloroplasts, which are responsible for photosynthesis. The arrangement of veins and interveinal areas in leaves is important for nutrient and water transport.
Those are likely muscle veins or superficial veins, which conduct oxygen-depleted blood back to the heart. These veins generally travel parallel and closely together along the length of the muscle or body part.