The flow is helped by a series of one-way valves in the veins that only allow the blood to move upwards. |
There are 4 chambers, two upper and two lower, separated by one-way valves. |
This can be done with a finger, or with a one-way speaking valve like those manufactured by Passy-Muir. |
It is a one-way conduit for moving excess water, proteins, and molecules back into circulation. |
And the Fresh Air's one-way valve honks when you exhale, emitting a sound akin to the call of an amorous sea lion. |
At the beginning of expiration, you tum the valve creating a one-way valve that only allows expiratory airflow. |