Tissue

Tissue

• is a cellular organizational level intermediate between cells and a complete organism
• a tissue is an ensemble of cells

kinds of tissue

• Ephitelium - Tissues composed of layers of cells that cover organ surfaces such as surface of the skin and inner lining of digestive tract: the tissues that serve for protection, secretion, and absorption.
• Connective tissue - As the name suggests, connective tissue holds everything together. Connective tissue is characterized by the separation of the cells by non-living material, which is called extracellular matrix. Bone and blood are connective tissues.
• Muscle tissue - Muscle cells are the contractile tissue of the body. Its function is to produce force and cause motion, either locomotion or movement within internal organs. Muscle tissue is separated into three distinct categories: visceral or smooth muscle, which is found in the inner linings of organs; skeletal muscle, which is found attached to bone in order for mobility to take place; and cardiac muscle which is found in the heart.
• Nervous tissue - Cells forming the brain, spinal cord and peripheral nervous system.