HHP 3500 Lecture Notes - Lecture 36: Abdominal Cavity, Nostril, Thoracic Cavity
2 Nov 2016
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Inspiration- movement of air into alveoli via airways. Expiration-moving air from alveoli back to environment via airways: moves opposite of inspiration. Respiratory cycle-pattern of one inspiration and one expiration. Angled downward: lung lobes- right lung has three lobes, whereas left lung has two lobes due to heart off-centered. Oxygenated blood flows into right side of heart. Low resistance conduits to move air through respiratory structures; like large arteries leaving heart. Cilia and mucus to trap and remove dust/foreign passages. Trachea: have cartilage rings, which provides support for airway and props it open, divides into right and left bronchi, then divide into bronchioles. Bronchioles: cartilage structure stops, no cartilage, contains smooth muscle in tubing, which allows for constriction or relaxation, this allows primary site of air resistance, these are under autonomic control. Bronco dilation-caused by sns, to allow rapid breathing. Bronco constriction-caused by pns: respiratory zone. Contain many alveoli that are entirely perfused by pulmonary capillaries.
