Foods and Nutrition 1021 Lecture Notes - Lecture 3: Cold Shock Response, Sensorium, Ibuprofen

• School: Western University
• Department: Foods and Nutrition
• Course: Foods and Nutrition 1021
• Professor: Noelle Martin

Document Summary

Mammals must maintain a constant body temperature of 37. 5 degrees c or 98. 6 degrees f. Q: what creates the equilibrium between heat production and heat loss in the body: peripheral sensors, central sensors, cerebral sensors. Heat loss: conduction: heat transfer between objects in direct contact (surface, water etc) ** up to 40% of heat loss in nude human is convection: radiation: infrared and solar radiation that is radiated off the body. Objects absorb and reflect this radiative heat ex) solar radiation on a sunny day increases body temp. ex 2) on a cloudless night, net loss of radiation occurs to the sky. ** up to 45% heat loss: evaporation: energy is either absorbed or given off when water changes states amount of heat exchange depends on humidity, dry environment sweat evaporates, humid environment limits evaporation of sweat. ** at rest, evaporative heat loss from respiratory tract and skin accounts for 15% of heat loss.