Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Unidirectionally describes a process that occurs in a single direction. In biological systems, it often refers to the one-way flow of substances like blood or other fluids.
5 Must Know Facts For Your Next Test
Blood flows unidirectionally through the heart and circulatory system to ensure efficient oxygen and nutrient delivery.
Valves within veins and the heart chambers prevent backflow, maintaining unidirectional flow.
The lymphatic system also relies on unidirectional movement to return interstitial fluid to the bloodstream.
Arterial blood moves away from the heart while venous blood returns unidirectionally to the heart.
Disruptions in unidirectional flow can lead to medical conditions such as varicose veins or heart valve disorders.
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Related terms
Hemodynamics: The study of blood flow and its properties within the circulatory system
Venous Return: The process by which deoxygenated blood is transported back to the heart from various parts of the body
Valvular Function: Refers to how valves operate within veins and the heart to regulate one-way blood flow