arteries thick walled and elastic blood vessels capillaries and veins
A
arteries
A
"capillaries"
placenta
arteries thick walled and elastic blood vessels capillaries and veins
The veins are neither strong nor thick of the blood vessels. On the contrary the veins are thin and thin walled. The arteries are strong and thick. They have to bear the pressure of the blood that comes from the heart.
Capillaries are not thick. They are extremely thin. They are of approximately 5-20 micrometers in diameter. They are the thinnest blood vessels in the body
This is not because of pigment but because of a thick layer of blood vessels beneath the skin.
The uterus wall becomes thick and rich with blood vessels.
Arterial walls contain thick, muscular tissue to pump blood throughout the body. Veins have thinner walls.