Introduction to Cell Tissue and Organ

1667 WordsFeb 11, 20127 Pages
Title: Introduction to cell, tissues and organ Objectives: 1. To study the different type, function, structure and histology of cell, tissue, and organs in human body. 2. To learn how to identify different cell and tissue based on their structure and shape. 3. To learn how to use the microscope properly to observe the slide of different cell and tissue. Introduction: Cell is the basic structural and functional units of an organism that are composed of chemicals. Cell is the smallest living unit in the human body. Cell is divided into three main parts which are the plasma membrane, cytoplasm, and nucleus. The plasma membrane forms the cell flexible outer surface, separating the cell’s internal environment(everything inside the cell) from…show more content…
Columnar epithelium forms the lining of the stomach and intestines. Some columnar cells are specialized for sensory reception such as in the nose, ears and the taste buds of the tongue. Goblet cells are found between the columnar epithelial cells of the duodenum. They secrete mucus, which acts as a lubricant(Wikipedia, 2011). 2. Stratified epithelium differs from simple epithelium in that it is multilayered. Stratified squamous epithelium cell consists of squamous epithelial cells arranged in layers upon a basement membrane. This type of epithelium is well suited to areas in the body subject to constant abrasion, as it is the thickest and layers can be sequentially sloughed off and replaced before the basement membrane is exposed. It forms the outermost layer of the skin and the inner lining of the mouth, esophagus and vagina. Stratified keratinized surfaces are protected from abrasion by keratin and kept hydrated and protected from dehydration by glycolipids produced in the stratum granulosum. Stratified cuboidal epithelia is a type of epithelial tissue composed of cuboidally shaped cells arranged in multiple layers. They protect areas such as ducts of sweat glands, mammary glands, and salivary glands. Stratified columnar epithelia is a type of epithelial tissue composed of column shaped cells arranged in multiple layers. Stratified columnar epithelia are found in the ocular conjunctiva of the eye, in parts of the pharynx and anus, the female’s
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