4 years ago

Marking Brainlest!!!!!

1 answer:

4 0

1. Respiratory Pump : During inspiration and expiration a pressure difference is formed between the thoracic capacity and abdominal capacity forcing blood back to the heart

2. Gravity : drains head and neck; increases when limbs are flat or elevated, helps blood in the upper body return to the heart

3. Muscle Pump: Contracts during exercise, compressing veins located between them

4. Smooth Muscle: Layer within the vein wall that venoconstricts to aid in the movement of blood

Hope this helps!

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