Some people have muscle twitches during this part of sleep. Then answer questions about the passage below. The inflammation also causes an increase in airway responsiveness.
Learn how you can identify a brown bear in the wild and other interesting facts in this reading activity. All mammals and birds also sleep. Yes, that's right! All people sleep. Learn interesting facts about ostriches in this nonfiction article.
Learn all about this miniature armadillo! This article includes short answer and multiple choice questions, vocabulary words, and a writing prompt. The morphologic changes that occur in asthma include bronchial infiltration by inflammatory cells.