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

Info icon This 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 barb2right 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 R values during the aerobic catabolism of CHO, lipids & proteins * 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?
Image of page 1

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

View Full Document Right Arrow Icon
Factors that affect MR MR by ingestion of food barb2right SDA (specific dynamic action) barb2right DIT, anti-obesity process (diet-induced thermogenesis) Basal MR vs. Standard MR 1. Basal MR barb2right heterothermies (mammals/birds) barb2right thermoneutral zone 2. Standard MR barb2right poikilothermies (fish/reptiles) barb2right fasting & resting state
Image of page 2
MR and Body size Example: MR and Body size
Image of page 3

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

View Full Document Right Arrow Icon
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

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern