Why does the pulmonary vein not have valves?

Valves are used to prevent back-flow of blood. The pulmonary vein delivers blood from the heart to the lungs which is a short distance; the heart can pump blood efficiently with no back-flow so valves are not needed. Also, the pressure is much lower in veins (compared to arteries) which also means no back-flow of blood.

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My name is Zuzanna and I'm currently an A-level student studying biology, chemistry, maths and Spanish. I'm very eager to share my knowledge and hope that you will choose me to be your tutor. In my time at school I have participated in the UKMT maths challenge and received a bronze and a silver certificate on two separate occasions. I have participated in house maths at my school as well as the in the Royal Engineering Masterclass at Brunel University in year 9. These have all helped me gain a deeper understanding of maths and physics. I was also selected to participate in an inter-school Spanish competition in year 8. Recently, I have taken part in Biology Champions and Chemistry Champions from the RVC which have helped me understand the 2 subjects better. I run a STEM club at school for KS2 so have experience in planning lessons and executing them. I have also helped some family members with their work and taught my brother to read in Polish.

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