The Structure Of Epithelial Tissue

1595 WordsApr 5, 20177 Pages
Epithelial tissue, which is also known as epithelium, “is a sheet of cells that covers a body surface or lines a body cavity” (Marieb & Hoehn, 2013, p.118). The primary functions of epithelial tissue are to form boundaries between different environments, act as a barrier of protection, and to secrete, absorb and filter specific material (Marieb & Hoehn, 2013, p. 117). Epithelial tissue is found on the lining of the gastrointestinal tract organs and other hollow organs and on skin surface (epidermis) (Betts et al., 2017). In regards to the structure of epithelial tissue, when looking at a surface view of an epithelial cell it will appear like a honeycomb; all epithelial cells have six sides which are somewhat irregular. This specific shape…show more content…
Nervous tissue is the main component of the nervous system which consists of the brain, spinal cord, and nerves. This tissue consists of neurons and supporting cells which are the two major cell types of nervous tissue. Neurons are cell processes that may quite long in structure as the extend from the cell body which contains the nucleus. Neurons function as transmitters of electrical signals from sensory receptors to effectors such as muscles and glands. Nervous tissue supporting cells primarily support and protect the neurons (Marieb & Hoehn, 2013, p. 140). “Muscle tissues are highly cellular, well-vascularized tissues that are responsible for most types of body movements” (Marieb & Hoehn, 2013, p. 136). All muscle cells contain the myofilaments actin and myosin which bring about movement and contraction in all cell types. There are three main classes of muscle tissue; skeletal, cardiac, and smooth muscle. Skeletal muscles form the flesh of the body and are attached to the bones of the skeleton. Skeletal muscles allow for voluntary movement, facial expressions, and locomotion. Cardiac muscle is found only in the walls of the heart. Cardiac muscle contraction allows blood to push through blood vessels and to the rest of the body. Smooth muscle is found mostly in the walls of hollow organs such as the digestive tract. This muscle appears “smooth” with no

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