5. What are the benefits of the following-
a. Skin has stratified squamous epithelial tissue.
b. Respiratory tract has ciliated columnar epithelial tissue.
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a..Stratified epithelium is also a lining tissue which provides protection for underlying tissues. ... In keratinized stratified squamous epithelium the outermost layer is composed of tightly packed dead cells filled with the protein keratin.
b..The conducting passageways of the respiratory system (nasal cavity, trachea, bronchi and bronchioles) are lined by pseudostratified columnar epithelial tissue, which is ciliated and which includes mucus-secreting goblet cells. ... This epithelium is exceedingly thin to facilitate diffusion of oxygen and CO2.
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A) protect from injury, give protein
B) to respire effectively
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