Circulatory System
8 questions tagged Circulatory System — spanning every one of the seven Ws.
Which blood vessel is the largest in the human body?
The aorta is the largest blood vessel in the human body.
Which is the largest vein in the human body?
The inferior vena cava is the largest vein in the human body. It returns blood from the lower body to the right side of the heart.
How does the heart keep blood moving in one direction?
Heart valves open and close with pressure changes to stop blood from flowing backward. The heart’s four chambers and valves work together as a one-way pump.
How do arteries and veins differ?
Arteries carry blood away from the heart under higher pressure, while veins return blood to the heart under lower pressure. Veins have valves to help stop backflow.
What are capillaries?
Capillaries are the body’s tiniest blood vessels, where oxygen, nutrients, and waste are exchanged with tissues.
Which human body system has the longest network?
The blood vessels form the longest network in the human body. If laid end to end, they would stretch for about 100,000 kilometres.
How many chambers does the human heart have?
The human heart has four chambers: two atria and two ventricles. This layout lets the heart separate oxygen-poor blood from oxygen-rich blood.
How many valves are in the human heart?
The human heart has four valves. They act like one-way gates to keep blood flowing in the correct direction.