Class Notes (835,574)
Canada (509,252)
HMB200H1 (140)
Lecture 13

Lecture 13

2 Pages
Unlock Document

Human Biology
John Yeomans

HMB200 L13; Feb. 28, 2012 Hypothalamus & Homeostasis (continued) Endotherms  Produce own body heat; warm-blooded  5X bigger brains than reptiles due to internal body heat  Birds & mammals control body temperature near 37ºC.  Advantages: Constant physiology, better brain fn, bigger brains, adaptation to extreme envts. o Not envt’al temp dependent so brain & body doesn’t slow down, so faster & better brain fn’ing allowing for survival  Costs: More insulation needed (fat, feathers, fur), more energy needed, more internal controls. Temp Control Systems  Temp maintenance – anterior nuclei  Cold-sensitive neurons in anterior hypothal  Sympathetic  Metabolism of brown fat  get warmer  Need recs for temp on skin, throughout body & in hypothal to main body temp  Afferents: receive temp measurements  Neural regions: CPG – central pattern generator??  Effectors: heat regulation  Heat dispersal – posterior nuclei??  Accelerated respiration – ex. dogs  Dilation of cutaneous – pink skin  Parasympathetic  Perspiration - sweat Fluid Regulation  Body made up of ~65% H O, 2or cell chemistry,
More Less

Related notes for HMB200H1

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.