Tag: lumen

Nephron: Introduction and Structure

The structural and functional unit of kidney is called nephron. There are millions of nephrons (1-1.3 million) in each kidney. The count of nephron decreases...

Simple permanent tissue (plants)

A permanent tissue is a group of cells that have lost the power of cell division and growth. These cells have attained their definite form...

Differences Between Arteries and Veins

S.N  Arteries  Veins  1. Carry blood away from the heart. Bring blood towards the heart  2. Wall is thick and strong. Wall is thin and...