AS PE OCR A+P Venous Return
- Created by: Sorcha
- Created on: 11-04-13 11:49
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- Venous Return Mechanisms - Starlings Law (SV is dependant upon VR)
- Pocket Valves
- Prevent back flow of the blood
- direct the blood flow back to the heart
- Skeletal Muscle Pump
- Veins are situated between the muscles
- when contracting and relaxing they help push/squeeze blood through the veins
- Veins are situated between the muscles
- Respiratory Pump
- During exercise breathing becomes deeper and faster
- causing greater pressure changes in the thorax, therefore increasing the pressure in the abdomen
- causing the blood in the veins in this area to be squeezed back to the heart
- causing greater pressure changes in the thorax, therefore increasing the pressure in the abdomen
- During exercise breathing becomes deeper and faster
- Smooth Muscle
- The smooth muscle in the veins VENO-CONSTRICTS
- helps squeeze the veins for blood the go back to the heart
- The smooth muscle in the veins VENO-CONSTRICTS
- Gravity
- Blood from the upper body above the heart in aided by gravity
- helps blood flow back to the heart
- Blood from the upper body above the heart in aided by gravity
- These help prevent Blood pooling
- where the blood sits in the muscles and veins because there is lack of pressure to return to the heart
- Pocket Valves
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