Lungs
CO2 + H2O vapor
Liver
Amino groups removed from amino acids, amino group converted to urea, remaining amino acids broken down by cellular respiration
**liver breakdown RBC
Urea
Excreted by kidney or sweat
Sweat glands
H2O + salt + very small amount of urea (all 3 form perspiration)
sweat is removed via
diffusion
perspiration helps
body temperature regulation (homeostasis/dynamic equilibrium)