hello! Please help me choose the correct answer for the following questions:
pseudostratified avascular squamous columnar microvilli transitional absorption exreacellular endothelium cuboidal mucus secretion lumen basement membrane
1. The special name for the simple squamous linging of a blood vessels is __________?
2. The hollow space with in a tube or strycture in the body is known as a _________?
Thanks!