
Heaven M. answered 04/27/21
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Expert of English Language, Experienced Tutor, Ecology, Evolution
Hi Squish,
- Valves throughout the lymphatic system only allow lymph to flow in one direction, so it can never flow backwards.
- There is smooth muscle attached to the lymphatic vessels that contracts.
- Skeletal muscles create pressure in the body when they move.
I hope this helps!
-H. Morrow

Heaven M.
No problem :)
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04/27/21
Squish G.
Thank you! Highly appreciated.04/27/21