Venous Return
- Created by: andrew123456789
- Created on: 12-03-18 12:42
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- Venous Return Mechanisms
- Smooth muscle
- The layer of smooth muscle in the vein wall venoconstricts to create venomotor tone which aids the movement of blood
- Muscle pump
- During exercise, skeletal muscles contract compressing the veins located between them, squeezing the blood back to the heart
- Pocket valves
- One-way valves located in the veins which prevent the backflow of blood
- Respiratory pump
- During inspiration and expiration, a pressure difference between the thoracic and abdominal cavity is created, squeezing the blood back to the heart
- As exercise increases respiratory rate, the respiratory pump is maximised
- During inspiration and expiration, a pressure difference between the thoracic and abdominal cavity is created, squeezing the blood back to the heart
- Gravity
- Blood from the upper body, above the heart, is helped to return by gravity
- Smooth muscle
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