PATHOLOGY

Detailed explanation-1: -A few types of tissue are composed of cells that have left the cell cycle permanently, and are therefore unable to proliferate. These nondividing tissues (or permanent tissues) include cardiac and skeletal muscle. Tissue repair in these tissues always leaves permanent evidence of injury, such as a scar.

Detailed explanation-2: -Scars are part of the body’s healing process. As part of your immune system, your skin is the barrier to protect you from germs and other harmful substances. When skin is injured, the body creates new tissue made of collagen to help reseal itself.

Detailed explanation-3: -Epithelial and connective tissues replace damaged or dead cells from a supply of adult stem cells. Muscle and nervous tissues undergo either slow regeneration or do not repair at all.