Provide physical protection Control permeability Provide sensation Produce specialized secretions There are various specialized types of epithelia. They can be sorted by cell shape and the number of cells between the basement membrane and the exposed surface of the epithelium. The three basic shapes of epithelial are squamous, cuboidal, and columnar. If the basement membrane is only covered by one layer of cells it is called a simple epithelium. If the basement membrane is cover by several layers of cells it is called stratified epithelium.
Tissues and Tattoos The four types of tissue are epithelia, connective tissue, muscle tissue and neural tissue. They are all different but all serve a general purpose to cover, fill and protect what is underneath. Epithelia cover exposed surfaces, line internal passageways, chambers and produce glandular secretions. Connective tissues are responsible for filling internal spaces, provide structural support and store energy. Muscle tissue contract to produce active movement.
3/24/2014 Structure of the Kidney: Basic Diagram of the Kidney of the human body Renal hilus: The renal hilus is an indentation near to the centre of the concave area of the kidney. This is the area of the kidney through which the ureter leaves the kidney and the other structures including blood vessels (illustrated), lymphatic vessels, and nerves enter/leave the kidney. Renal capsule: The renal capsule is a smooth, transparent, fibrous membrane that surrounds, encloses, and protects the kidney. Each kidney has it's own renal capsule (outer layer), which helps to maintain the shape of the kidney as well as protecting it from damage. The renal capsule is itself surrounded by a mass of fatty tissue that also helps to protect the kidney by damage by cushioning it in cases of impact or sudden movement.
Classification of Tissues Objective: The purpose of this lab exercise is was that know the various tissues found in the human body, and to familiarize myself with their composition and function. I learned that the four primary tissue types in the human body are epithelium, connective tissue, nervous tissue, and muscle tissue. These tissues have unique structures, patterns, and functions. I identified the subcategories of the tissues using a compound light microscope. I had to list the general functions and structural characteristics of the primary tissues.
In describing the cellular components of skeletal muscle, several specialized terms are used such as the plasma membrane of skeletal muscle is called the sarcolemma; its cytoplasm is known as sarcoplasm; the endoplasmic reticulum is called the sarcoplasmic reticulum. The term motor unit is used to describe a group of muscle fibers innervated by a single motor nerve, the fibers within a single motor unit contract simultaneously (Van and Marleen,2000). Each muscle cell is surrounded by a sarcolemma and has many nuclei occurring at intervals along its length. The nuclei are displaced peripherally within a cross section of the sarcoplasm while a large number of longitudinal myofibrils, groups of arranged contractile proteins, occupy most of the center space(Tortora and Derrickson,2011). Based on nerve stimulation studies, skeletal muscles are divided into two muscle fiber types, the first type is called Slow-twitch muscle fibers which mainly rely on aerobic metabolism.
Compare and contrast the functions of each tissue type. Why do some areas of our body have stratified squamous epithelium and other areas have simple squamous epithelium? Epithelial tissues - It protects us, and it absorbs with the stomach and intestinal lining Connective tissues - Support, surround, connect other tissues, Protect organs, Transport fluids and dissolved materials Muscle tissues - Responsible for body movement, Moves blood, and food waste through body’s organs, Responsible for digestion. There are three types smooth, skeletal and cardiac muscle tissues. Nervous tissues - Conducts impulses organs from neurons.
Main tissues in the body There are four different types of tissue in the body, these are muscle, connective, nervous and epithelial; and for each type of tissue there are several sub-categories. In this essay I am going to describe the function of each type of tissue and the sub-categories. Muscle The muscle tissue has three different sub-categories which are striated, non-striated and cardiac. The muscle tissue is made up of muscle fibres, which can shorten, contracting and then returning to the pervious shape, which is known as relaxing. These movements cause the blood and other materials like urine, faeces and food, soft tissue and skeleton to move.
Sensory nerves send messages to the glands and the muscles, telling them what to do. Epithelial Tissue The functions of epithelial tissue include transportation of materials, protection of underlying tissues, absorption of water and nutrients and secretion of waste products. Epithelial tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers. This tissue is specialised to form the covering or
All the substances entering or leaving the body must pass through epithelium and are under its control. The ion-transporting epithelium may become highly specialized for absorption or excretion. * The glandular secretions of the body by glands (exocrine and endocrine) are mainly a function of specialized epithelium. Polarity: Epithelial cells are polarized cells and we can distinguish different areas of the cells (apical, basal, and lateral) with specific structural modifications (unlike other tissues, where structural polarity is not found). Specific structures found on the apical surface
The lymphatic system is made up of lymphatic vessel and lymphatic organs. The lymphatic system has four main functions; lymphatic capillaries absorb excess tissue fluid and return it to the bloodstream. In the small intestines, lymphatic capillaries called lacteals absorb fats in the form of lipoproteins and transport them to the bloodstream. The lymphatic system also is responsible for the production, maintenance and distribution of lymphocytes. It also helps defend the body against pathogens.