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valve
pharynx
a flap of tissue that prevants blood from flowing backward is
Venous valves .
your skin of course!
Venous valves .
valve
Heart valve.
The semilunar valves prevent backflow into the ventricles. The pulmonary semilunar valve prevents backflow in the right ventricle, and the aortic semilunar valve prevents backflow of blood in the left ventricle.
nether, the epiglottis is a flap of tissue that prevents you from chocking its doesn't digest anything
Venous valves .
valves