Outline The Principal Types Of Tissue In The Body

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1. Outline the most important functions of the cells. Cells have a number of important functions & these are as follows: They carry out growth & repair, the cell absorbs nourishment, it is capable of reproduction by dividing, it carries out excretion of waste products. Some specialist cells also have the power of movement. Cells are also capable of communication (hormones from endocrine gland cells & neurotransmitters from nerve cells binding to receptors) & defence (proteins – antibodies, bind to harmful substances – antigens & carry out actions to make them harmless. 2. Describe what Protoplasm is. Protoplasm is the living centre of a cell surrounded by plasma membrane. It is the entire substance of the cell.…show more content…
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. The membrane of these structures may be up to 12 layers. Stratified tissue is found in the mouth, oesophagus, vagina & the urethra. The outer layer is continually being shed. The third type of squamous tissue is transitional, this is grouped with the stratified. This is found in the bladder or uterus & is designed to withstand the action of urine. Columnar or glandular – These are single layered cylindrical shaped cells. These cells secrete mucous which assist with lubricating the oesophagus to help with passing of food. These cells are found lining food passages. They are also capable of absorbing other substances such as nutrients & fluid whilst lining the walls of the…show more content…
Fibrous – this made up of 2 types & these are white & yellow fibrous tissue. The white tissue does not stretch, examples of these would be ligaments or tendons. The yellow tissue is found in the walls of arteries, bronchi & alveoli. Areolar – This is found under skin & mucous membrane, it is also found surrounding blood vessels & nerves. It is the general supporting or packing tissue of the body. The type is loosely woven & has a gelatinous (protein containing glue like substance) substance between cells. Fatty tissue or Adipose – this type is made up of globules of fat that are found in thin membranous envelopes. It is found under the skin around the kidneys, bone marrow & the heart. It can provide protection, insulation & reserve food. Cartilage – This type is made up from a firm bluish white substance & there are 3 types. These are: Elastic which is found in the ear & epiglottis. Hyaline which can be found around the ends of bone (in the nose, larynx) & fibro cartilage which is found in the vertebrae in the spine or in the knee

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