The Middle Layer, which is the Smooth Muscles.
are you seriously asking this question? no veins are not muscles, they are veins
No, muscles have nothing to do with how many veins God gave you.
They are involuntary muscles.
artery
because of the blood muscles that push the heriastic pulley. the move the blood through the veins and arteries.
no veins carrys blood towards the heart
Smooth muscles constrict veins when blood pressure suddenly drops. These types of muscles are the non striated, involuntary muscles found in blood vessels, veins, arteries, the uterus, the bladder, and reproductive tracts.
yes
There are three types of veins, superficial veins that are just beneath the surface of the skin, deep veins that are large blood vessels found deep inside muscles, and perforator veins that connect the superficial veins to the deep veins.
Thee difference between muscle in veins and arteries is that muscles of arteries are thicker compared to those of veins.
the contraction of muscles
Because your muscles are contracting and blood is filling the muscles being worked ( thats why your veins bulge when lifting)