Cell structures and their function.

Epithelial cell

This a membranous tissue that is composed by one or more layers of cell which is then separates by the small intercellular. Most of the eternal and internal surface of the body and the organ is covered by the form of substances.

The functions of the epithelial cell are:

• Absorption: there are specific epithelial cells that has a inside layer where that small intestine to absorb the nutrient when the food is digested. 
• Excretion: as the epithelial tissues are resent in the kidneys, the excrete waste the body produces are reabsorbed from the urine and as sweat are also excreted from the body there swat glands in the epithelial cells.  
• Diffusion: the diffusion of the gases like nutrients and liquids are influenced by the simple epithelium as they form a thin layer it is the right cells for diffusion in the gas.
• Protection: The cell protects the tissue from having harmful chemicals like pathogens, excessive water loss and from having reflex injury.
• Secretion: these are present in the glands as the epithelial tissue is determined to away the chemical substances like hormone, enzyme and lubricating fluid.
• Sensation: the stimuli are sensed by specific epithelial cells tissues that have sensory nerves that are found in the eyes, ears, nose, and tongue and on the skin.

Nerve cell

These cells are the type that send out messages from the body to and back from the brain.

The function of cells is that it carries and delivers important information from body to the brain about the things we sense out side. The nerve cell delivers information to the rain like electricity so that when information is received it can too be shared with the nerve cells  and then be changed in the chemical information that are in-between the two cells and be changed back to electricity by the new cell.

Connective

The connective is mostly about the components exiting unlike the other components. Many of the tissue are very similar to one anther. The role of the connective is:

*to derived from mesoderm usually,

*characterised mainly by the traits of the non living tissues

*and to structure and support the cells

In the human body the cartilage, bone and the blood are recognised as connective tissue but s they all vary compared to the other tissues  

Muscle cells

The muscle cells have contractile filament which assist with movement of the cells and aids in changing the size as well. The contractile organs have a special tissue  and is the movement from the bone to the other parts of the body.  

Cardiac, skeletal and smooth muscle are in the muscle cells and its role is to create motion cases and force. Low motion can be caused by the muscle of there are movement of the internal organs. The smooth contraction and the cardiac occur when it can’t be cognisant as its needed if it wants to live. The tissues of the mucle are made up of fibres, which bonds affective during the bodily movement.

        

 Ribosomes

 

BTEC National Health and Social Care book 2

Chromosomes

BTEC National Health and Social Care book 2

DNA

BTEC National Health and Social Care book 2

Secretary granules  

BTEC National Health and Social Care book 2

T-RNA

BTEC National Health and Social Care book 2

M-RNA

BTEC National Health and Social Care book 2