Outline the principal types of tissue in the body. The principal types of tissue in the body are as follows: There is the Epithelium type which is a membrane that covers or lines an internal surface. Epithelium is the tissue that specializes in absorption, secretion & provision of protective barriers. It is broken down into 3 main types & there are: Squamous – which itself is broken down into 3 types, the first being simple, which are flat smooth cells that line the interior of the heart, they line the alveoli & the insides of blood vessels. The second type is stratified & these are also flattened, but are also layered.
P2 Outline the Main Tissues Of The Body Epithelial Epithelial tissue is basically the linings of both the internal and external surfaces of the body and can be divided into two groups. The groups depend upon the number of layers of which it is composed. These two groups are simple epithelial and compound. Simple squamous are thin, flat plates and their main function is osmosis (which is the passage of water molecules from a region of low concentration to one of high concentration through a semi-permeable membrane) and diffusion (which is the passage of molecules from a high concentration to a low concentration). They form the lining of cavities such as the mouth, blood capillaries, heart and lung alveoli and make up the outer layers of the skin.
Based on the observations below, give the name and functions of each. * Simple Cuboidal – Functions in secretion and absorption * Pseudo stratified Columnar - functions in secretion and movement of mucus by ciliary action * Nonciliated Simple Columnar - functions in secretions and absorption * Stratified Squamous - function is protection * Simple Squamous - functions in filtration and diffusion and in secretion in serous membranes * Transitional - permits distension 6. How do stratified and pseudo stratified epithelia differ? Stratified epithelia are made up of multiple layers of cells. Pseudo Stratified epithelia consist of a single layer of cells where all cells are in contact with the basement membrane but do not necessarily have an apical surface.
If it is two or more cells thick such as the skin, it is known as stratified epithelium. Understand the different types of epithelial tissue can be confusing so I have created a table which breaks down epithelia into a more understandable format. Layers | Cell Shape | Location | Simple
Epithelial cells that produce secretions are called gland cells. Individual gland cells are scattered with other cells in an epithelium. In a glandular epithelium, most or all of the cells produce secretions and they are discharged as “exocrine”. Exocrine is discharged onto the surface of the epithelium. “Endocrine” secretions are released into the surround tissue fluid and blood.
They are bean-shaped, approximately 1 – 25 mm long, and act as a lymph filter. They are positioned in groups in specific regions of the body and named after that region, eg. inguinal (groin) and axillary nodes (arm) (Rhoades et al 2003). The node’s outermost layer is the capsule, dense connective tissue covering the node, which extends into it in extensions called trabeculae that section the node into compartments, providing structural support and a route for blood vessels to enter the node, via which B and T cells can also enter (Milling n. d.). Deep to the capsule is a network of reticular fibres and fibroblasts which, with the capsule and trabeculae, make up the stroma.
P2 There are two different types of epithelial tissue these are simple and compound. Simple Epithelium- this type of epithelium tissue is from an animal consisting of one of more layers of closely packed cells. The cells can vary in structure depending on their function which may be protective, secretory or absorptive. This epithelium tissue covers external and internal surfaces of the body. Compound Epithelium – this type of epithelial tissue is made to withstand wear and tear.
Thermoregulation is supported through sweating and regulation of blood flow through the skin and synthesis of Vitamin D occurs. As the body gets older, poor nutrition or disability occurs, the skin is under pressure of getting damage through pressure sores. Factors such as shearing, friction and compression are the major cause of a person to have developed a pressure sore. 1.2… Describe the changes that occur when damage caused by pressure develops. Discoloration of intact skin not affected by light finger pressure (non blanching erythema) this may be difficult to identify in darkly pigmented skin.
Having too few or too many red blood cells can be a sign that you have certain diseases. The hematocrit test, also known as a packed-cell volume test, is a simple blood test. The test is done by drawing blood from the patient into a test tube. Once that is done the test tube is put into a centrifuge and spun in high speeds. This displacement causes the formation of three layers.
Skin and the Integumentary System A. Skin is composed of 2 main layers 1. Epidermis is made of keratinized stratified squamous epithelial tissue, is superficial to the dermis, and is avascular. 2. Dermis is mainly connective tissue, is deep to the epidermis, and is vascular * The skin contains collagen (for strength) and elastic (for stretch) fibers.