Biology 3601A/B Lecture Notes - Lecture 1: Isometry, Heart Rate, Negative Relationship
2 Nov 2018
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Scaling: scaling is the structural and functional consequences of changes in size or scale among otherwise similar organisms . Isometry: proportions stay the same with changes in size, 1:1 relationship, ex. Metabolic rate has a slope of 0. 75: hypometric, slope 0: there are some things that never scale with body mass, slope less than 0, ex. Heart rate decreases with increasing body size: note: both axes are log values. It will increase due to the extra sa. Mass-specific metabolic rate: divide both sides by body mass, and rearrange, =(cid:3028, =(cid:4666)(cid:3029) 1(cid:4667, new slope = -0. 25. What does this mean: size does matter! Things that don(cid:859)t s(cid:272)ale (cid:449)ith (cid:271)ody size: biochemistry, ex. Hb:rbc ratio, electrical potentials, etc: chemical measures, electrical potentials. Genuine exam questions: draw the relationship between x and y, body mass and mass specific mr, b = -0. 25, body mass and mr, b = 0. 75, sa and volume, b = 2/3, sa and volume ratio, b= -1/3.
