At any given time there is more blood in the venous system than that of the arterial system. Which of the following features of the veins allows this? (a) relative lack of smooth muscles (b) presence of valves (c) proximity of the veins to lymphatics (and) thin endothelial lining
Answers
Answer:At any given time there is more blood in the venous system than that of the arterial system. the following features of the veins allows this is thin endothelial lining.
Explanation:
Vein structure
The walls of your veins are made up of three different layers:
Tunica externa. This is the outer layer of the vein wall, and it’s also the thickest. It’s mostly made up of connective tissue. The tunica externa also contains tiny blood vessels called vasa vasorum that supply blood to the walls of your veins.
Tunica media. The tunica media is the middle layer. It’s thin and contains a large amount of collagen. Collagen is one of the main components of connective tissue.
Tunica intima. This is the innermost layer. It’s a single layer of endothelium cells and some connective tissue. This layer sometimes contains one-way valves, especially in the veins of your arms and legs. These valves prevent blood from flowing backward.
Answer:
c)proximity of the veins to lymphatics