The valves help counter the effect of gravity by preventing the fluid in the vessels from "falling down."
No relationship at all.
There is a very great relationship between density and specific gravity. Density contributes to the weight of a substance under specific gravity.
weight = mass x gravity
Everything
i have no clue
Gravity is a force and its effect on a mass is measured in newtons.
Gravity, because of the structures of gravity, gravity has no measure whereas density has units of mass..
The force of gravity decreases as the distance between two bodies increases.
the relationship between buoyant force and gravity is that both definitions have to do with floatation . gravity and buoyant both keep you your object afloat so that it does not submerge
weight = mass x gravity
Gravity pulls at the rock fragments causing them to move.
Valves in veins are one way valves in the tunica intima(endothelium) of the drainage vessel. They allow the blood to defy gravity and continue circulating up towards the heart to dump into the inferior/superior vena cava. They ensure that blood travels the direction it is supposed to, and does not fall back the wrong way. Lymphatic capillaries are part of the capillary exchange that occurs from artery->artierole->CAPILLARY DIFFUSION->venule->vein->heart. they are an accessory drainage system, beginning blindly in the body and eventually meeting up with the vein again.