Final answer:
Venous blood is typically slower, clots more easily, and has a darker color compared to arterial blood because it contains less oxygen and is under lower pressure.
Step-by-step explanation:
The type of blood that is usually slow and clots easily, and isn't a bright red is venous blood. Venous blood has passed through capillaries and venules, where it has lost much of its oxygen, causing it to be a darker color than the bright red oxygen-rich arterial blood. As blood moves through the veins, the pressure is lower compared to arteries, and because of this, along with the mechanisms like valves that prevent backflow, clotting can occur more readily under certain conditions, such as being static for long periods, which can lead to conditions like deep vein thrombosis (DVT).