Explain the terms tissue and organ and the relationship between them
Identify the differences between squamous epithelium, ciliated epithelium goblet cells
Make connections between the lung DVD and structure of lungs
Tissue – a group of similar cells specialised to carry out the same function
Organ – a structure made up of different kinds of tissue. E.g. Lung – squamous epithelium; elastic tissue
Squamous epithelium – make up the alveoli (tiny holow sacs in the lungs)
Thin, flattened cells
Epithelium – a lining tissue
Advantages – short distance between air in the alveoli and the blood in the capillary. This means gas exchange is very efficient
Shaped like a goblet (hence their name)
Produce large amounts of mucus (a glycoprotein)
Dirt and bacteria in the air that is breathed in gets trapped in the mucus. When mucus reaches the throat it is swallowed. The dirt and bacteria is then destroyed by the acid and enzymes in the stomach.
Have tiny hairs called cilia.
Beat together in a rhythm moving mucus back up the trachea into the throat.
Cigarette smoke damages cilia – why do smokers have a persistent chesty cough and are prone to lung infections?