the salivary glands in mammals are exocrine glands

organ nose face head hand mouth eye skin ear salivary glands mammals exocrine mammalian saliva duct system humans paired major parotid submandibular sublingual gland salivary parotid secreting amylase digestion serous oral mandibular bone mouth muscle health infection acini cell nerve lumen secretory mucous enzyme stomach protein teeth education science isolated anatomy structure tongue swallowing tissue medicine