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 after about 45 to 50 years of age at the rate of 0.8% to 1% every year. Nephron is generally formed by two parts: a) Renal corpuscle or malphigian corpuscles … Read more
Introduction 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 and size. These cells may be dead or living, thin walled or thick walled. They are formed by the differentiation of the meristematic cells. The permanent tissue can be … Read more
S.N Meristematic tissues Permanent tissues 1. Cells are continuously dividing and the process is rapid. Cells do not divide continuously. 2. Thin walled cells. Thin walled or thick walled cells. 3. Made up of simple undifferentiated cells. Cells are differentiated. 4. Have power of cell division. Do not have power of cell division. 5. Cells … Read more
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 weak. 3. Located deep in the body away from the skin except wrist, neck, etc. Located close to the skin i.e. superficially. 4. Narrow lumen. Wide lumen. 5. Internal valves … Read more