Kinesiology 2230A/B Lecture Notes - Lecture 13: Thermoregulation, Vital Capacity, Partial Pressure

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2230A/B
• Professor: Glen Belfry

Document Summary

This system is involved in the uptake portion of vo2. Alveoli tissue laid out flat: 1/2 a tennis court. Fluid filled - insulates lungs from things happening external to that in the chest cavity. Held out because of the vacuum located in the pleural space. Action of diaphragm and costal muscles affects intrapleural and intrapulmonary pressures leading the inspiration and expiration. During lower ventilation rates the diaphragm is used to change lung volume. At higher volumes the costal muscles (rib muscles) begin to aid in breathing. Slope of inspiration is much smaller, takes muscle contraction. Expiration is relaxation of muscle so it happens a lot faster. At neutral pressure there is no movement of air. If pressure in the room is lower then the pressure in the lung you exhale. If pressure in the lung is lower then you inhale. Air moves from high pressure to low pressure. Becomes more negative or less negative but still negative.