• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Outline the structure of the main tissues of the body.

Extracts from this document...

Introduction

P2 ? Outline the structure of the main tissues of the body. TISSUES A tissue is an ensemble of similar cells and from the same origin, which together carry out a specific function. There four types of tissues in the human body, which provides diverse functions. The four main types of tissue are: Epithelial Tissue Epithelial tissue covers the whole surface of the body. It is specialized to form the covering or lining of all internal and external body surfaces, it also forms glands. These cells have different functions such as protection, sensation, secretion, absorption, and excretion, diffusion, cleaning and reducing friction. It is classified by the number of cells layers and the shape of surface cells. Types of Epithelial Tissues Simple Epithelial cells may be Squamous, cuboidal, columnar or ciliated. Simple Squamous cells: They have the appearance of thin, flat plates which allows rapid movement of substances. They tend to have horizontal flattened, elliptical nuclei because of the thin flattened form of the cell. They form the lining of cavities such as the mouth, blood vessels, and heart and air-sacs lungs and make up the outer layers of the skin. Cuboidal cells: They are roughly square or Cuboidal in shape. Cuboidal cells may have microvilli and are responsible for secretion or absorption. Each cell has a spherical nucleus in the centre. Cuboidal epithelium is found in glands and in the lining of the kidney tubules as well in the ducts of the glands. ...read more.

Middle

It consists of different types of blood cells: Red blood cells (erythrocytes) Is a very small cell with an elastic membrane, whose function is to transport Oxygen and Carbon dioxide in the blood. Red blood cells do not have a nucleus. It contains an iron-rich protein called haemoglobin which gives the cell the reddish colour. White blood cells (leukocytes) These cells are larger, nucleated and less numerous. They made up part of the immune system. These cells defend the body against infections assisting in the production of antibodies. Platelets (thrombocytes) They are products of much larger cells that have broken up. These cells have an important role in blood clotting. Plasma (the matrix) It consists of 90% water and contains nutrients, proteins, hormones and waste products. Cartilage Cartilage is an elastic, flexible, firm, tough and translucent substance. It is composed of closely packed collagenous fibers. No nerves or blood vessels occur in the cartilage. It can be found in the knee joint, between spinal vertebra, in the nose and in the ear flaps. The skeleton of humans is composed of cartilage. It provides strength and flexibility also protects the bones ends from friction during movement. Bone Bone is a harder substance that can be worn away by friction. Bone is a part of the skeletal system. It consists of calcium salts and collagen fibres. Bone can be either compact or spongy, it depends on how the cell and matrix are organised. ...read more.

Conclusion

A single skeletal muscle cell is long and cylindrical in shape, with many nuclei located at the edges of the cell. Skeletal Muscle tissues are attached to bones. Skeletal muscle tissues are voluntary, which means that can be made to contract or relax by conscious control. It roles include the movement of the skeleton, under conscious control, including movement of limbs, fingers, toes and neck also the movement of tissues of facial expression under conscious control e.g. the ability to smile and to frown. Cardiac Muscle Tissue Cardiac muscle tissues are striated, involuntary in action and branched. This tissue is found only in the wall of the heart. Cells are joined by one another via intercalated an disc, which allows the synchronization of the heart beat. Its main function is to pump blood to all parts of the body from the heart. Smooth Muscle Tissue, Non-striated Smooth muscle tissues are made up of thin-elongated muscle cells that have one centrally located nucleus. It forms the muscle layers in the walls of hallow organs such as digestive tract, the walls of the bladder, the uterus, various ducts of glands and the walls of blood vessels. Contractions of smooth muscle constrict they surround. This is particularly important in the digestive system in which the action of smooth muscle helps to move food along the gastrointestinal tract as well as breaking the food down further. Smooth muscle also contributes to moving fluids through the body and to the elimination of indigestible matter from the gastrointestinal system. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Molecules & Cells essays

  1. Epithelial tissues

    Muscle Tissue, which is located only in the heart and is responsible for moving the blood and maintaining the blood pressure. Connective tissues which are responsible for the form and shape of the animal/human body and, in addition, provide protection for vital organs and facilitate locomotion.

  2. Anatomy and physiology - cells, tissues and systems of the body. Describe the ...

    Using RNA ribosomes also produce proteins from amino acids witch then is exported and used within the cell Structure of the cell and its functions Describe the structure of the main tissues of the body and their role on the functioning of two named body organs.

  1. Liver and its role

    Emulsification means that the bigger molecules of lipids, which tend to "clump" together, are being broken down into smaller groups or even individual molecules. Then enzyme lipase causes them to be broken down into smaller one molecule of glycerol and three fatty acids (hydrolysis reaction).

  2. The human body - Action and control

    Simple Sugars - Benedict's Solution (From original color Blue to Brownish Yellow) Fat Protein - Biuret (To Purple) Digestive Organs *The gut is a long tube, which runs from the mouth to the anus. (About nine meters long) Salivary Glands - Production of saliva that contains amylase (a form of carbohydrase)

  1. The Skin

    The Hypodermis (Subcutaneous Layer) Lying just underneath the dermis, the subcutaneous layer is the base foundation and the innermost layer of the skin. This is the layer responsible for the production and storage of fat, which is a combination of areolar tissue (elastic fibres which give the skin flexibility and elasticity)

  2. Cells and Tissues

    It can fill with newly synthesized proteins just as the rough endoplasmic reticulum does. The nuclear envelope is enmeshed in a network of filaments for stability 5. Lysosme - The lysosomes have sometimes been likened to "The Police Force of the Cell".

  1. The Origin of the Mitochondrion.

    Another scenario focuses on the possible parasitic nature of the initial interaction, and the selection that guided the host to develop mechanisms to convert any initial detrimental effects of the symbiosis to beneficial or at least neutral effects (Blackstone 1995).

  2. Types of tissue and their functions in the human body

    they are tall, creating a square profile with a spherical nucleus at its centre. Simple cuboidal cells are classified as simple since they consist of only a single layer of cells. Depending on their location, some simple cuboidal cells, such as the ones lining the surface of the lines the

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work