Abstract
This chapter assesses the tissues and cells involved in respiration. Respiration is the transport of oxygen into cells and tissues, and the removal of carbon dioxide. The respiratory system consists of two parts: a system of tubes and passages for conduction of the air, and a respiratory portion in which gaseous exchange occurs. The conduction portion includes the nose, pharynx, trachea, and bronchi, while the respiratory portion includes respiratory bronchioles, alveolar ducts, and alveoli. Alveoli are sac-like structures that make up the majority of lung tissue and are the sites where exchange of O2 and CO2 takes place. The very thin wall of the alveoli and their close proximity to a dense network of capillaries allows the diffusion of oxygen from inspired air into arterioles, and the removal of carbon dioxide from venules into the alveolar space for removal during expiration.
Published Version
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