KINE 1020 Lecture Notes - External Intercostal Muscles, Internal Intercostal Muscles, Stroke Volume
22 Apr 2014
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Nasal passage: warms and moistens air, cleaned by cilia, cilia push foreign substances and mucous up, until he epiglottis, so that it can be swallowed. Conductive (dead air space /no gas exchange: mouth/nose trachea larynx bronchi bronchioles, brings air into body, humidifies, warms and filters air, 17% of air breathed out is oxygen. Respiratory zone (gas exchange: bronchioles alveoli. Gas exchange between blood and alveoli: diffusion of gasses from high to low, capillaries wrapped around alveoli. Inspiration external intercostal muscles expand ribcage (muscles between ribs) Exhalation passive no muscle involvement, forced = internal intercostal muscles contract ribcage. 100 110 sympathetic is activated: stroke volume elastic recoil reduced peripheral resistance. With exercise blood vessels will dilate and have more blood supply calories. Vo2: mets easy for people who have no background in physiology, 1met = 3. 5ml o2/kg/min, amount of energy you use at rest, marker of exercise intensity. Higher fat mass, lower muscle mass, lower met value than expected.
