Concerning the normal structure of blood vessels, the following is/are true:
A. In utero, hemangioblasts give rise to both vascular conduits and hematopoietic tissue
B. In development, smooth muscle tubes precede endothelium
C. After birth, growth of large vessels does not change the number of elastic and smooth muscle layers
D. Adventitia includes the external elastic lamina
Answer:A
Concerning the normal structure of blood vessels, the following is/are true:
A. In utero, hemangioblasts give rise to both vascular conduits and hematopoietic tissue B. In development, smooth muscle tubes precede endothelium C. After birth, growth of large vessels does not change the number of elastic and smooth muscle layers D. Adventitia includes the external elastic lamina