Q.The study of structure and arrangement of tissue is called as _____________

Histology is the study of the structure and arrangement of tissues. A tissue is a group of cells sharing a common embryonic origin, structure and function, that work together to perform a shared job. Tissues sit at the level of organisation between individual cells and whole organs: cells combine into tissues, tissues combine into organs, and organs combine into organ-systems, which together build the body — Cells → Tissues → Organs → Organ systems → Body.

An animal's body cells are of two kinds: somatic cells (all body cells except the reproductive cells) and germ cells (sperm and ova, part of the reproductive system). The animal body is built from four basic tissue types, each with its own distinct structure and role:

• Epithelial tissue — covers and lines body and organ surfaces; mainly protective, also absorptive/secretory.
• Connective tissue — binds, supports and strengthens other tissues and organs; the most widely distributed tissue in the body.
• Muscular tissue — made of contractile fibres that shorten on stimulation, producing movement.
• Nervous tissue — made of impulse-generating and impulse-conducting neurons, bringing about rapid communication within the body.

Each of these four tissue types, and their sub-types, is described in detail below.