HSCI 100 Lecture Notes - Lecture 11: Medulla Oblongata, Intercostal Muscle, Lung
8 Dec 2016
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Left lung is pushed over because of the heart! Traf c crossing: the air and food pipes overlap! When you swallow, the larynx (voicebox) moves up against the epiglottis to! close off the opening to the trachea. The trachea: a tube, often called the windpipe, that connects the larynx with the 1 bronchi, made of connective tissue, smooth muscle, and c-shaped cartilaginous rings, lined with cilia and mucus that help to keep the lungs. The lungs: the bronchi, bronchioles and alveoli beyond the 1 bronchi make up the lungs, the right lung has 3 lobes while the left lung has 2 lobes. These divide further into lobules: each lung is enclosed by a membrane called a pleura. The mucus is eventually swallowed. pleura help keep lungs expanded. The alveoli: ~300 million in the lungs that greatly increase surface area, alveoli are surrounded by capillaries, the alveoli and capillaries are one cell layer of epithelium.
