Flap-like structures that maintain blood flow in one direction only, through the heart and pump.
(of a vein).....................A membrane inside the vein that prevents backflow of blood.
doorways†that open and close to let blood move and prevent backflow of blood. There are valves between the heartâ€(tm)s chambers.
flap-like structures which control the flow of blood through the heart.
Flaps of tissue in the leg veins which open and close to prevent blood from flowing backwards.
Cup-like folds inside a vein that prevent backward flow of blood. Valves open as blood moves through them and close under the weight of blood collecting in the vein due to low pressure and gravity.
the "doors" between the chambers of the heart. The heart valves are tricuspid, pulmonic, mitral, and aortic.
Devices with passages for directing flow into alternate paths. ( 060)
(the heart valves are tricuspid, pulmonic, mitral, and aortic) - the "doors" between the chambers of the heart.
Components inserted into air ducts or devices which permit modification of the air resistance of the system and consequently a complete shut-off of the air flow (control valves).
specialized tissues in the heart between the chambers that open and close while the heart beats, and help to move blood in one direction through the heart and body.
The heart has 4 valves; the aortic, mitral, pulmonary and the tricuspid
A device placed in the plumbing line which restricts or obstructs water flow to create desired hydraulics, or may permit flow in one direction only (as in a check valve).
Devices with passages for directing flow into alternate paths or to prevent flow.
(n) Mechanical devices used to control the flow of liquids and gases through piping systems. The four major functions of valves are to start and stop flow, regulate flow, prevent backflow, and relieve pressure. Valves can either be manual or computer controlled and can be set to respond automatically to conditions in the pipe.
Flap-like structures that prevent the backflow of blood flow through the heart or veins.