They are basically four types of human tissues. They include: epithelial, connective, muscular and nervous tissues.
Epithelial tissue covers
the body surface and forms the lining for most internal cavities. The
major function of epithelial tissue includes protection, secretion, absorption,
and filtration. The skin is an organ made up of epithelial tissue which
protects the body from dirt, dust, bacteria and other microbes that may be
harmful. Cells of the epithelial tissue have different shapes; it can be thin, Flat or elongate.
Connective tissue is
the most abundant and the most widely distributed of the tissues. Connective tissues perform a variety of functions including support and protection. The following tissues are found in the human body, ordinary loose connective
tissue, fat tissue, dense fibrous tissue, cartilage, bone, blood, and lymph,
which are all considered connective tissue.
Muscular tissue: There are three types of muscular tissues: skeletal, smooth, and cardiac. Skeletal muscle is a voluntary type of muscle tissue that is used in the
contraction of skeletal parts. Smooth muscle is found in the walls of
internal organs and blood vessels. It is an involuntary type. The
cardiac muscle is found only in the walls of the heart and is involuntary in
nature.
Nerve tissue is
composed of specialized cells which not only receive stimuli but also conduct
impulses to and from all parts of the body. Nerve cells or neurons are
long and string-like.
In tissues the
simplest combination is called a membrane, or a sheet of tissues which cover or
line the body surface or divide organs into parts. Examples include the
mucous membrane which lines body cavities. Tissues combine to form
organs.