Lecture7-2009W

Lecture7-2009W - M = aW b (allometric Eq) 2....

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Metabolic Rates (= rate of energy consumption) I. MR measurement A. Direct calorimetry - Antoine Lavoisier b accurate but hard to measure B. Indirect calorimetry (1) based on respiratory exchange * respiratory exchange ratio (R) = respiratory quotient (RQ) = [CO2] produced / [O2] consumed (2) based on material balance * Ratio of heat production to O2 consumption and CO2 production Practice question1 : Calculate MR at an O2 consumption Of 10mL/min. (a) if CHO is oxidized? (b) if lipids are oxidized?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Factors that affect MR MR by ingestion of food b SDA (specific dynamic action) b DIT, anti-obesity process (diet-induced thermogenesis) Basal MR vs. Standard MR 1. Basal MR b heterothermies (mammals/birds) b thermoneutral zone 2. Standard MR b poikilothermies (fish/reptiles) b fasting & resting state
Background image of page 2
MR and Body size Example: MR and Body size 1. Allometric function of body weight
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: M = aW b (allometric Eq) 2. Weight-specific MR M/W = aW (b-1) Physiological implications 1. number of mitochondria in fish swim muscles 2. heart size-heart rate-body weight Ecological implications 1. bomass vs. basal food requirement (BFR) * bomass: 3,500 mice (x 20g) = a 70,000g deer * BFR: 440 mice = 1 deer b/c mouse BFR=8x 2. MR vs. biomass of populations 3. MR vs. environmental pollutants 3. MR-body weight relation has physiological & ecological implications 1. Surface flow (by Max Rubner) S = V 2/3 S=r 2 , V=r 3 , r 2 =(r 3 ) 2/3 * for endothermies but allometric relation is also found in ectothermies 2. Fractal theory * scale independence, self-similarity, complexity, and infinite length * due to fractally structured transport systems 3. Multiple causes theory Why allometric metabolism-weight relations?...
View Full Document

Page1 / 4

Lecture7-2009W - M = aW b (allometric Eq) 2....

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online