Respiration_During_Exercise

Respiration_During_Exercise - Respiration During Exercise...

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Respiration During Exercise
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Introduction The Respiratory System Provides a means of gas exchange between the environment and the body Plays a role in the regulation of acid- base balance during exercise
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Respiration 1. Pulmonary respiration Ventilation (breathing) and the exchange of gases (O 2 and CO 2 ) in the lungs 1. Cellular respiration Relates to O 2 utilization and CO 2 production by the tissues This chapter is concerned with pulmonary respiration, and “respiration” will be used to mean such
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Function of the Lungs Primary purpose is to provide a means of gas exchange between the external environment and the body Ventilation refers to the mechanical process of moving air into and out of lungs Diffusion is the random movement of molecules from an area of high concentration to an area of lower concentration
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Major Organs of the Respiratory System Fig 10.1
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Position of the Lungs, Diaphragm, and Pleura Fig 10.2
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Conducting and Respiratory Zones Conducting zone Conducts air to respiratory zone Humidifies, warms, and filters air Components: Trachea Bronchial tree Bronchioles Respiratory zone Exchange of gases between air and blood Components: Respiratory bronchioles Alveolar sacs
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Fig 10.2
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Pathway of Air to Alveoli Fig 10.4
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Mechanics of Breathing Inspiration Diaphragm pushes downward, lowering intrapulmonary pressure Expiration Diaphragm relaxes, raising intrapulmonary pressure Resistance to airflow Largely determined by airway diameter
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The Mechanics of Inspiration and Expiration Fig 10.6
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Muscles of Respiration: end here Fig 10.7
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Pulmonary Ventilation (V) The amount of air moved in or out of the lungs per minute – Product of tidal volume (V T ) and breathing frequency (f) V = V T x f
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Pulmonary Ventilation (V) • Dead-space ventilation (V D ) “Unused” ventilation Does not participate in gas exchange Anatomical dead space: conducting zone Physiological dead space: disease • Alveolar ventilation (V A ) Volume of inspired gas that reaches the respiratory zone V = V A + V D
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Pulmonary Volumes and Capacities Measured by spirometry Vital capacity (VC) Maximum amount of air that can be expired following a maximum inspiration Residual volume (RV) Air remaining in the lungs after a maximum expiration Total lung capacity (TLC) Sum of VC and RV
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Pulmonary Volumes and Capacities Fig 10.9
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Exercise-Induced Asthma Temporary narrowing of the airway that occurs shortly after the onset of exercise. With appropriate treatment, almost everyone with exercise-induced asthma can enjoy the mental and physical benefits of regular exercise. The large number of elite athletes who have asthma attests to the
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Respiration_During_Exercise - Respiration During Exercise...

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