These cells make up the leading cell differentiation. Its apical surface is covered with cilia. The movement of cilia facilitates the transport of sputum. and foreign particles to the pharynx mucosal transport epithelial cells The mucus-producing glands secrete mucus on the surface of the epithelium. which protects it from mechanical influences infection and others The epithelium also contains many types of endocrine glands, EC,D,P, which are hormones that regulate muscle tissue. of the local respiratory tract

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