B.The chemicals must be secreted by endocrine glands.
C.Target cell must have specific receptor molecules for the chemical.
D.The combination of the chemical and its receptor must cause specific changes to
occur in the target cell.
Adaptive thermogenesis is the heat energy expended by the body in response to all of
the following EXCEPT
A.increase in ambient temperature.
B.digestion of food.
D.decrease in ambient temperature.
Carbon monoxide is lethal because it
A.reduces CO2 and slows breathing.
B.increases CO2 and causes seizures.
C.binds hemoglobin preventing oxygen binding.
D.increases oxygen unloading at the cells.