Which structure contains deoxygenated blood?
Pulmonary arteries
Aorta
Pulmonary veins
Left ventricle
Left atrium
Which of the following is true of arteries?
The walls of arteries and veins are about the same thickness in a given tissue
Arteries lack an endothelial layer
Their thick walls are due entirely to the bulk of elastic fibers in the middle layer
Their walls are thick and muscular compared with veins
Vein walls are thicker than arteries because veins must pump blood up from the lower body