What are the four types of tissues found in the human body and what are the primary functions of each one.

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ncchemist eNotes educator| Certified Educator

Tissues are groups of cells that work together to perform a particular function.  There are four different types of human tissues: epithelial, connective, muscle, and nerve.  They are each discussed below.

Epithelial tissue is lining tissue.  It composes the skin and linings of internal body cavities.  It can be found in different shapes (flat, cubic, elongated).  Its major functions include protection, filtration, absorption, and secretion.

Connective tissue is the most common tissue in the human body.  It is primarily used for structural support and protection.  It covers a wide variety of uses.  Blood, bone, lymph, and cartilage tissues are considered connective tissue.

Muscle tissue is involved with the contraction of muscle fibers.  It is found in two major forms, voluntary and involuntary.  Voluntary muscle tissues include skeletal muscles which contract when the brain sends a controlled impulse to do so.  Involuntary muscle tissues include smooth lining muscles and heart muscles and are controlled without specific human thought.

Nerve tissues are composed of nerve cells called neurons.  They are elongated and form neural networks that conduct impulses from all over the body to the brain.

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