Question

what is tissue and how does it work

Answer 1

A tissue is a group of similar cells that together serve a specific function in the body. The word tissue comes from the word “tisser”, meaning something woven, just like the cells are “woven” together in clumps and are made of layers.There are 4 main types of animal tissue, and those are:1: Epithelial tissue. This type of tissue is found in the surface of skin, the reproductive tract, theairways and the inner linings of the digestive tract.Epithelial tissue is theonly tissue that is in direct contact to the outer world mainly viathe skin.Its main functions are:*.protection from the outside environment*.Absorption of water and other nutrients*.Elimination of waste*.Secretion of enzymes and hormones in theform of glandsThey are classified bythe number of layers of cells they have: simple(one layer of cells) and stratified(multiple layers of cells). Although cilia and other cellular featuresmight be taken into consideration when classifying them.Some kinds of epithelium are:*.Simple squamous epithelium*.Stratified squamous epithelium*.Pseudostratified columnar epithelium*.Glandular epithelium2: Nervous tissue. Cells comprising the central nervous system and peripheral nervous system are considered neural tissue.We have some types of cells that make up the neural tissue like:*.Astrocytes*.Microglial cells*.Oligodendrocytes*.Schwann cellsThe main function of this type of tissue is the communication between the central nervous system with the peripheral nervous system.3: Muscle tissue. It is a soft tissue that composes muscles inanimal bodies.It is classifed in three main types, which are:*.Skeletal muscle*.Cardiac muscle*.Smooth muscleIts main function is tomake movement and motion of the body possible.4: Connective tissue. It is the tissue that connects the other types of tissues. It is made up of cells separated by non-living matter that is called the extracellular matrix.It is made up of 3 types of fibers:*.Collagenous fibers*.Elastic fibers*.Reticular fibersIt is a vascularized tissue that’s very important to the proper function of theother types of tissue

Answer 2

Tissue is a group of cells that have same origin , function .
Our body is composed of various types of tissue which have different functions such as excretion,absorbtion,respiration,etc