HKIN 425 Lecture Notes - Lecture 14: Cellular Respiration, Lean Body Mass, Red Blood Cell
Document Summary
Heart, blood and lungs: after birth, left > right, especially the left ventricle (b/c pumps against a higher resis- tance) Follows scammon"s general growth curve: body weight; fat free mass, volume correlates with weight (0. 74) vs. height (0. 48, 40 cm3 at birth, 80 cm3 at 6 months, 160 cm3 at 2 years, 600-800 cm3 in young adulthood. Functions: heart rate (basal laying down, birth 140 20 bpm (? no sex difference) Systolic measure of the force exerted by the heart: diastolic pressure of the blood on the arterial walls. In general, increases during growth (as heart rate decreases) Size (volume) - increases proportional to weight: rate - decreases by ~ 50% Stroke volume increase ~ 15x: cardiac output - increases 10 x, blood pressure - continuous increase, therefore power output of the heart increases from birth to maturity. Blood: volume: related to body weight and heart size (. 90, predictive of vo2 peak during childhood and adolescence.
