Four main types of tissues in our body Essay Sample
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Four main types of tissues in our body Essay Sample
Produce a written assignment which shows an understanding of the main tissue types and the role they play in two named organs (examples of where each tissue type might be found). An outline of the four main tissue types and the role tissues play in two organs, which should be named. Tissue types of our body To understand what a tissue is, it is necessary to know what a specialised cell is; a cell would be specialised for a certain function, so their structure allows them to fulfil their function. Therefore, a tissue is a group of same specialised cells with same functions, which combine.
There are four main types of tissues in our body: epithelial, connective, muscle and nervous. Epithelial tissue: These are the tissues that line the surfaces of the skin, digestive and respiratory system. It can be considered as a barrier, and things can selectively pass across this barrier. Two forms occur in the body: Membranous epithelia: Form the coverings or linings of organs. Glandular epithelia: Surrounds glands within the body. Types of Epithelium Simple squamous: It is squeezed allowing simple diffusion of materials.
Located in the kidneys, blood vessels, air sacs of the lungs. Simple cuboidal: Single layer of cells, cube-like in shape, allowing secretion and absorption. Located in the kidneys, ovaries and various glands. Simple columnar: Tall and column-like, one layer of cells, allowing absorption and secretion with the help of mucus and tiny hair like cilia. Located in the digestive throat, glands, parts of the lungs such as the branching bronchi and uterus. Stratified squamous: Multilayer, squeezed cells protecting the underlying tissue from abrasion.
Containing keratin, is located in the dry upper layer of skin. The nonkeritanized type, meaning without the protein keratin, is located in the moist parts of the mouth, oesophagus, vagina, urethra, and anus. Stratified cuboidal: Multilayer of cells, allowing protection of glands. Located in mammary, saliva, sweat glands. Stratified columnar: Multilayer of cells, allowing protection and secretion. These are rare in the human body. Located in the male urethra. Pseudostratified columnar: Varying in height, allowing secretion and movement of mucus.
Located in the windpipe, upper respiratory tract, sperm ducts, and glands. Transitional: Combination of multilayer of different types of epithelium tissues, resembling stratified squamous and stratified cuboidal combined, allowing stretching and distending to make room for urine containment. Located in the urinary system, especially the bladder.
Loose connective tissue: It is the most common type of connective tissue in vertebrates. It holds organs in their place and binds epithelial tissue to other underlying tissues. Located in beneath epithelial tissues, lymph nodes, spleen, and liver. Dense connective tissue: It is known as fibrous connective tissue as well, is composed of large amounts of closely packed collagenous fibers. These structures help muscles attach to bones and link bones together at joints. This type of connective tissue is found in tendons and ligaments.
Specialized connective tissues: Perform specific functions which are essential to homeostasis. The body contains four types of specialized connective tissue: Adipose: This type of connective tissue is a form of loose connective tissue that stores fat. The main functions of this tissue are store lipids (energy), insulation, cushion organs. The location is under skin, and around organs such as liver. Cartilage: It is a form of fibrous connective tissue and it’s composed of closely packed collagenous fibers in a rubbery gelatinous substance called chondrin.
The skeletons of human embryos are composed of cartilage. This tissue provides flexible support for certain structures in adult humans including the nose, trachea, and ears. Hyaline: covering articular surface of bones Elastic cartilage: external ear Fibrocartilage: disks between vertebrae Bone: It’s a type of mineralized connective tissue which contains collagen and calcium phosphate, a mineral crystal. Calcium phosphate gives bone its firmness. We use bone for structural support, protecting soft organs and mineral storage
Blood: Transports gasses and nutrients all around the human body. Located in blood vessels. This type of tissue consists of specialized cells that contract when are stimulated. Muscle tissue is the most abundant tissue in the body. There are three major types: Skeletal or striated muscle (voluntary): It is attached to bones by the tendons, and it’s controlled by the peripheral nervous system.
Cardiac muscle (involuntary): As it name says, it’s located in the heart. This muscle allows the synchronization of the heart beat. The heart consists of three layers: epicardium, myocardium, and endocardium. Smooth or non-striated muscle (involuntary): It is controlled by the autonomic nervous system, and it is called smooth muscle because it doesn’t have cross striations. Organs of the cardiovascular system, respiratory system, digestive system, and reproductive system are lined with smooth muscle. Located in blood vessels, the bladder, and digestive tract.
Neurons are the basic unit of nervous tissue, known as conducting cells as well, transmit impulses from one region of the body to another. In the brain we can find another kind of cells, which are the non-conducting cells known as neuroglia or glial cells. The functions of the glial cells are: Surround neurons and hold them in place Supply nutrients and oxygen to neurons Insulate one neuron from another Destroy pathogens and remove dead neurons