ANATOMY

Detailed explanation-1: -Tissue consists of groups of cells with a similar structure working together for a specific function. For example, neurons or nerve cells together make up the nerve tissue. The group of tissues form organ and the group of organs form the organ system.

Detailed explanation-2: -Group of similar cells which perform the same function are called tissues. Tissues are the intermediate level between cells and a complete organ. A tissue is formed by a group of similar cells from the same origin that together carry out a specific function.

Detailed explanation-3: -An organ is a structure that consists of two or more types of tissues that work together to do the same job. Examples of human organs include the heart, brain, lungs, skin, and kidneys. Human organs are organized into organ systems; the digestive system is shown in figure Figure 4.2.

Detailed explanation-4: -The cells are attached to each other by cell-cell adhesions, which bear most of the mechanical stresses. For this purpose, strong intracellular protein filaments (components of the cytoskeleton) cross the cytoplasm of each epithelial cell and attach to specialized junctions in the plasma membrane.