What is the function of valves in veins?

More Questions

• Why veins have valves?
• What is the function of time delay valve?
• What is the function of quick exhaust valve?
• What is the function of a flow control valve?
• What is state function and path function?
• What is the function of the excretory system?
• What is the work function of a metal?
• What is the function of stem class 6?
• What are the functional components of a digital computer?
• What is the main function of a firewall?