Assertion: circulatory system's vein | /r/Desires | gravity
Facets:
Source sentences:
text: Veins rely on gravity, inertia, and the force of skeletal muscle contractions to help push blood back to the heart.
text: Veins rely on gravity, inertia, and the force of skeletal muscle contractions to help push blood back to the heart.
text: Veins rely on gravity, inertia, and the force of skeletal muscle contractions to help push blood back to the heart.