Which layer of the typical vessel can be regulated to constrict or dilate the lumen?

TUNICA MEDIA is the layer of the typical vessel that can be regulated to constrict or dilate the lumen.

The constriction and dilation is done to adjust the volume of blood released to the tissues according to its needs.

Other layers of the typical vessels are tunica intima (inner tunic) and tunica externa (external tunic). Tunica media is found between these two layers. 

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.

Where is the data? ? and graph