Lec5 - Thermal Regulation II

Lec5 - Thermal Regulation II - Lecture 5 Thermal Regulation...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 5 Thermal Regulation II Reading: Chapter 13, pp. 633 – 634, 642 – 647, 652 - 653 Lecture outline: I. Surface Area to Volume Considerations II. Thermoregulatory Strategies i. Ectothermy ii. Endothermy III. Thermoregulatory Mechanisms in Ectotherms
Background image of page 1

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

View Full DocumentRight Arrow Icon
I. Surface Area To Volume Considerations Large Animal vs. Small Animal Considerations: Surface Area Volume Metabolic Requirements: Nutrition Respiration Excretion and Transport
Background image of page 2
Surface Area : Volume Ratio
Background image of page 3

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

View Full DocumentRight Arrow Icon
Tree shrew: appx. 200g Elephant: 5,000 - 15,000 Kg Metabolic Requirement: Total vs. per unit mass
Background image of page 4
Relationship Between Surface Area And Heat Exchange Body size e Surface Area e Surface area α Rate of heat exchange Large animals exchange heat slowly than small animals. Animals living in cold environments tend to be larger. Animals in colder climates have smaller extremities – reduced heat loss.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Two Major Strategies Ectothermy Most ancient but not primitive Obtain body heat from the external environment rather than producing it physiologically Body temperature depends on environmental temperature. Lower metabolic rate - they do not produce enough heat metabolically to keep themselves warm. Includes all invertebrates, fishes, amphibians, and reptiles. DO NOT occur in the earth’s coldest environments.
Background image of page 6
Endothermy More recent. Physiological thermoregulation by producing heat through
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 27

Lec5 - Thermal Regulation II - Lecture 5 Thermal Regulation...

This preview shows document pages 1 - 8. Sign up to view the full document.

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