🧵01
Blood Vessel Structure
See the three layers, or tunics, and the hollow lumen of a vessel wall.
Open →🩸02
Artery, Vein & Capillary
Compare the three types of vessels. Look at their walls, valves, and pressure.
Open →📉03
Blood Pressure
Learn systolic and diastolic pressure. Watch pressure fall as blood travels.
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Capillary Exchange
See how two pressures push fluid out and pull it back in.
Open →🗺️05
Circulatory Routes
Trace the lung loop, the body loop, the hepatic portal system, and the heart's own supply.
Open →⬆️06
Venous Return
The muscle pump and valves push blood back up to the heart.
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